Our primary eye care service includes a complete medical eye examination that analyzes eye health and vision function. In addition, Dr. Sumner provides testing for dry eye, keratoconus, glaucoma, cataracts and macular degeneration. Sumner Vision also offers glasses, contact lenses, and pre- and post-operative care in association with the ophthalmologists at CUHealth Ophthalmology Department.

Eye & Vision Exam

Medical Eye Examinations

During a yearly or bi-yearly examination, Dr. Sumner’s patients will receive a patient history review, a series of vision and eye tests, assessments of eye focusing and movement, and an eye health evaluation. Dr. Sumner will then discuss any additional testing that may be required to diagnose an eye disease or condition. Call us a today at 303-321-1606 to schedule an appointment.

Eye Exam and Consultation

During an eye exam, Dr. Sumner will ask you questions about any symptoms or issues you are experiencing, medications your are currently taking, any blurry vision, your work environment, and your overall health. Family history and previous eye or vision conditions will also be discussed during this part of the examination. Dr. Sumner will consider this information when determining any treatments or recommendations.

Vision Testing

Regular vision testing and evaluations ensure that you always have the clearest vision possible. Dr. Sumner provides regular vision acuity tests as part of a comprehensive eye exam. Dr. Sumner will measure how each eye is seeing by using a wall eye chart and a reading eye chart. The results of these tests are portrayed as a fraction, with 20/20 being the standard for normal distance and reading vision. Depending on the results of your vision test, Dr. Sumner may prescribe corrective glasses, contacts, or eye exercises, or specialized treatments to insure a pristine ocular surface and tear film. A stabilized tear film is very important because 60-70% of the focusing power of the eye occurs at the tear film.

Eye Function Testing

In addition to vision testing, an eye exam in our Denver office includes testing eye functionality. Dr. Sumner performs several tests to evaluate depth perception, color vision, eye muscle capabilities, peripheral vision, and responsiveness to light. Several other simple tests are completed to determine whether the eyes are focusing, moving, and working together properly. The test results enable Dr. Sumner to diagnose any underlying conditions that may be impairing the eyes ability to focus or work together.

Eye Health Testing

As part of a comprehensive eye exam, Dr. Sumner examines the overall health of the eye through a visual examination and tonometry. Dr. Sumner evaluates eye health by visually inspecting the eye and eyelids using magnification and a specialized microscope. To examine the internal structures of the eye, we may dilate the pupils. Increased eye pressure may be an indicator of glaucoma, so we utilize a new type of tonometry to measure eye pressure. The Icare tonometer pictured above is very gentle, and there is no puff of air! After completing these short tests, Dr. Sumner reviews the results and discusses any necessary treatment options with you. Contact us at 303-321-1606 today to schedule a comprehensive eye exam.

Contact Lenses

Not sure that glasses are for you? Ask Dr. Sumner about contact Lenses. Advances in the field of optometry have produced a variety of different types of contact lenses with a range of benefits. Rigid gas-permeable (RGP), daily-wear soft, extended-wear, extended-wear disposable, and planned replacement are the various types of contact lens options available today. Dr. Sumner will discuss the various options with you to determine which type will best fit your needs and lifestyle. Dr. Sumner specializes in the prescription of scleral contact lenses for keratoconus and severe dry eye. Schedule your examination today by calling 303-321-1606. There are many advantages to consider when determining if contact lenses are right for you and our knowledgeable staff is here to answer any questions.

Contact Lenses

Prior to prescribing contact lenses, Dr. Sumner determines what level of vision correction you require. Refractive error (commonly known as near sightedness, far sightedness, or astigmatims) is evaluated by measuring how the eyes focus when a series of different lenses are placed in front of them. two different objective automated instruments are first used by the technician to take these measurements. Dr. Sumner then carefully evaluates this information to provide a precise and customized final prescription. The refractive examination today requires fewer “which is better” questions for the patient! To schedule an appointment for a vision evaluation with Dr. Sumner, call 303-321-1606.

Corrective Lenses

After determining the level of refractive error, Dr. Sumner consults with you to determine whether contact lenses or glasses are best for your lifestyle. If you suffer from certain conditions, such as dry eye or allergies, glasses may be the most comfortable corrective solution. Dr. Sumner specializes in enhancing the ocular surface, so that more people can comfortably wear contact lenses. Contact lenses are available in either soft or rigid gas permeable form. Contact lenses need to be changed daily, weekly, bi-weekly, or monthly, depending on what type of lens you select. Specialized contact lenses, such as bifocal contact lenses and scleral lenses, are also available for patients with special eye conditions. Call us at 303-321-1606 to discuss if contact lenses are a good option for you.

Scleral Contact Lenses

Scleral lenses are large gas permeable contact lenses that have the comfort of soft lenses and the sharp crisp vision of gas permeable lenses. Dr. Sumner prescribes scleral lenses for severe Dry Eye, high astigmatism, keratoconus, LASIK failures and post-surgical complications, and other corneal irregularities. Please see our dedicated page for custom scleral contact lenses.

Open Custom Scleral Lenses And Pvr Prose

Contact lenses are not what they used to be… even two years ago. Technological advances have greatly improved contact lenses and lens care products – revolutionizing vision correction.

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Scleral contact lenses are large diameter gas permeable contact lenses specially designed to vault over the entire corneal surface and rest on the “white” of the eye, the sclera. In doing so, scleral lenses functionally replace the irregular cornea with a perfectly smooth optical surface to correct vision problems caused by Keratoconus, Lasik failures, high astigmatism, other post-surgical complications, and various corneal irregularities.

Scleral lenses are designed to vault the corneal surface and rest on the less sensitive surface of the sclera and are therefore more comfortable for a person with corneal irregularities. A special liquid fills the space between the back surface of the lens and the front surface of the cornea.

This liquid acts as a buffer and protects the compromised corneal tissue. Scleral lenses are designed to fit with little or no lens movement during blinks, making them more stable on the eye, compared with traditional corneal gas permeable lenses. These lenses are almost always very comfortable, and the vision provided by them is extremely sharp and crisp. The great majority of patients are able to wear their scleral lenses almost all of their waking hours without problems.

Dr. Sumner prescribes scleral contact lenses for a variety of hard-to-fit eyes, including keratoconus, severe dry eye, irregular corneas, high astigmatism, and post-surgical vision loss. Dr. Sumner neither avoids nor declines the challenge of prescribing the most difficult cases. Dr. Sumner tends to have a perfectionist demeanor. Call Dr. Sumner at 303-321-1606 with any questions or issues you may have.

Hard To Fit Contacts

Contact lenses are not an easy solution for every person suffering with vision problems. Some eye conditions make wearing contacts a difficult proposition. However, it does not rule out wearing contact lenses altogether. It just means patients need to discuss options with their eye care provider and obtain specialized hard to fit contacts for their specific vision problems.

Reasons for Hard to Fit Contacts
Finding contact lenses that fit and wearing contact lenses in general can be made more challenging when these conditions affect your eyes:

  • Astigmatism
  • Dry eyes
  • Giant Papillary Conjunctivitis (GPC)
  • Keratoconus
  • Presbyopia
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Astigmatism: Astigmatism develops when the front of the eye curves into a bulge or oval shape. It causes blurred vision and can be difficult to correct because regular contacts cannot account for the bulging.

Dry Eyes: When eyes become excessively dry, it leads to irritation, burning, redness and blurred vision. Contact lenses can exacerbate these conditions by making it feel like a foreign object is stuck in your eye.

GPC: This form of conjunctivitis is caused by inflammation on the inner surface of the eyelid. Protein buildup on contact lenses can make this condition worse.

Keratoconus: This is an uncommon condition that causes major discomfort when wearing contacts. Keratoconus happens when the cornea becomes thinner and allows the eye to bulge forward. The bulge forms into a cone shape.

Presbyopia: Eyes tend to have a tougher time focusing on close objects as they age. This condition is known as presbyopia. It typically affects people aged 40 or older.

Solutions for Hard to Fit Contacts

Wearing contacts is not impossible if you suffer from one of the above conditions. You do need to meet with an eye care professional, however, and get prescribed contact lenses that are tailored to deal with your specific vision condition.

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Gas permeable lenses are a good solution for patients who suffer from GPC or Keratoconus. A GP lens will limit protein deposits from accumulating which will reduce GPC symptoms. It is also effective in containing corneal bulging and relieving pressure on the tissue for a Keratoconus sufferer. The newest GP lens is a scleral lens which provides sharp vision and comfort like a soft lens. Please see our section on Scleral Lenses.

Toric lenses are useful for correcting astigmatism. Since the lens needs to align with the bulge it is correcting, toric lenses must not rotate in order to fit on the eye. They are typically custom made to correct a specific astigmatism. For that reason, this type of lens takes longer to make and costs more than a traditional contact lens. This type of lens is also being rapidly replaced by the newer scleral lenses.

Bifocal and multifocal lenses can help remedy presbyopia. Monovision lenses are another option for presbyopia. This type of lenses can have one fitted for distance vision and the other for seeing close objects.

Dr. Sumner specializes in treating Dry Eyes and other ocular surface conditions so that contact lenses are more comfortable and can be worn for longer periods of time.

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LASIK Surgery


Laser assisted in situ keratomileusis, commonly referred to as LASIK, is a corrective alternative to glasses or contact lenses. Like glasses or contact lenses, LASIK is a method for treating refractive conditions including nearsightedness (myopia), farsightedness (hyperopia), and astigmatism. At Sumner Vision, Dr. Sumner provides pre- and post-operative exams for LASIK and other eye surgeries. Call 303-321-1606 today to schedule an examination to see whether you are a candidate. We work with several premium professional refractive surgery centers in the Denver area.

Evaluation and Referral

LASIK (laser assisted in situ keratomileusis) surgery uses the latest advancements in technology to provide faster recovery times and precise results. LASIK surgery has been effective in treating myopia, hyperopia, astigmatism and other eye conditions. At Sumner Vision, we provide evaluations and referrals for patients interested in LASIK surgery. Dr. Sumner performs a complete review of your patient history as well as a full assessment of your eye health and vision. A current exam is important to determining if you are a candidate for LASIK surgery and if there are any other factors that may affect your results. The history review enables our optometrist to determine if your prescription is stable and you are healthy enough to consider surgery.

Once Dr. Sumner has performed the evaluation and determined whether you are a candidate for LASIK, you will be given a referral to the LASIK surgery center we have worked with on an ongoing basis. The center will perform advanced diagnostic testing and will evaluate your eligibility for surgery. Various surgery options will be discussed with you if you are determined to be a surgical candidate. We will be in correspondence with the center regarding your evaluation and surgical determination. If you are considering LASIK surgery, call us at 303-321-1606 to schedule a consultation.

Post-Operative Care

Once your surgery is scheduled, we will schedule follow-up appointments for you in our Denver office. Typically, you will begin these follow-ups the day after the surgery and continue at prearranged times over the following six months. After 1 year, a full exam is recommended to determine the long-term results of your procedure. Dr. Sumner is experienced in working with patients pre- and post-operation and will answer any questions that you have along the way. If you have questions about LASIK surgery, call 303-321-1606 to speak with our knowledgeable staff.

Advantages of LASIK

If you have worn glasses or contact lenses for a long time, you may have wondered if LASIK surgery is a good choice for you. While not everyone is a candidate for LASIK, it does have some great advantages. People who play sports, have allergies, or who are looking for simplicity will all benefit from LASIK. To learn more about LASIK and your vision, call Sumner Vision today at 303-321-1606.

High Order Aberrations Hoa Related To Lasik

High order aberrations (HOA) refer to complex imperfections of the optical system and are normally present in all eyes in minor unnoticeable amounts. However, as a result of optical refractive surgeries such as Lasik, unnatural and irregular shape of the cornea can result in increases in HOA and thus result in halos double vision, smears, and other visual disturbances. Improvement in lasers over the years has resulted in reducing HOAs but they are still present in some degree.

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Measuring and Diagnosing High Order Aberrations
High order aberrations are measured with a wavefront aberrometer. We use the Izon Aberrometer to measure the distortions of light as they pass through the patient’s cornea.

Wavefront aberrometry helps in diagnosing both lower order and higher order vision errors based on how the light passing through the eye focuses or refracts.

These are some of the HOAs measured with our Izon Aberrometer.

High Order vs. Low Order Aberrations
Lower order aberrations are common vision errors like nearsightedness(myopia), farsightedness (hyperopia), and astigmatism.

High order aberrations are coma, spherical aberration, and trefoil. These aberrations result in visual disturbances like glare, halos, starbursts, blurring, double vision, etc.

Eye Surgery

Eye Surgery Evolution

Advanced technology has made it possible to reshape eyes and restore vision to healthy levels for many people from all walks of life. Surgical techniques and tools have rapidly evolved over the past two decades to create procedures that are both safe and helpful.

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Corrective surgeries for eyes now include everything from using lasers to reshape the cornea surface to inserting artificial lenses. These procedures correct how light entering the eye is processed – leading to much sharper vision in patients.

The state of the cornea is a determining factor in these surgeries. Thinner corneas with a high degree of myopia, for example, usually require a more invasive surgery to reshape the eye surface enough to improve vision.

use attached image of man on surgical mask facing the camera and place it to the right of the verbiage above.

Types of Eye Surgeries

Laser correction surgeries offer a snapshot of evolution in eye surgeries. Photorefractive Keratectomy (PRK) became the first successful surgery to change the shape of the cornea through removing tissue. The FDA approved PRK in 1995 and it is still widely used early in the 21st Century. With PRK, it only takes a few days for vision improvements to be realized.

LASIK followed on the heels of PRK. It involves cutting a thin flap in the outer covering of the eye to reshape the cornea. Unlike PRK, it only takes a few hours to gain sharper vision with LASIK surgery. There is some risk of suffering dry eye and other complications such as halos around bright lights until the flap fully heals. LASIK can be done with the aid of a mechanical cutting tool, using all lasers or incorporating wavefront technology that measures how light hits the eye.

Nearsighted patients are not alone in benefiting from surgeries. Farsightedness can be corrected through Conductive Keratoplasty (CK). It uses a small probe and low heat radio waves to create spots around the cornea periphery. CK steepens the cornea to give patients better near vision.

Some eye surgeries require implanting new artificial lenses to produce vision improvements. Implantable lenses similar to contact lenses can correct more severe levels of nearsightedness. These artificial lenses go permanently over the natural lens on the eye. Refractive Lens Exchange (RLE) takes it a step further and replaces the natural lens with an artificial lens of a different shape. RLE is done to correct extreme farsightedness.

Eye Surgery Considerations

Our eyes change as we age, so some corrective surgeries are not a good option for everyone. People under 18, for example, are not good candidates for laser eye surgeries because their eyes change rapidly as their bodies are growing.

Health also factors into eye surgeries. If you have diabetes or other medical conditions that impact eyesight, certain eye surgeries may pose serious risks.

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Corrective surgeries for eyes now include everything from using lasers to reshape the cornea surface to inserting artificial lenses. These procedures correct how light entering the eye is processed – leading to much sharper vision in patients.

The state of the cornea is a determining factor in these surgeries. Thinner corneas with a high degree of myopia, for example, usually require a more invasive surgery to reshape the eye surface enough to improve vision.

use attached image of man on surgical mask facing the camera and place it to the right of the verbiage above.



Many patients with vision problems heartily embrace the idea of enjoying vision correction without having to wear eyeglasses or contact lenses. Not all of these patients, however, are good candidates for PRK or Lasik surgery, the two standard surgeries used to alter the way the cornea of the eye refracts light. If that describes you, don’t fret — because here at Sumner Vision, we offer an advanced corneal reshaping technique known as Precision Ortho-k, or POK. This non-surgical technique can produce changes to the way your cornea refracts light and help you to see 20/20 without glasses or contact lenses.

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To understand the benefits of POK, let us first consider how the cornea works. The cornea is a transparent, spherical bulge that sits over the lens of your eye. In addition to protecting the inner parts of the eye, the cornea also performs some lens-like tasks of its own. The shape of cornea causes incoming light rays to be refracted, or bent, in such a way that the lens can focus them into a clear, sharp image before they pass on to the retina and optic nerve.

Deformations in the shape of the cornea cause refraction to go wrong in various ways, producing the fuzzy images characteristic of nearsightedness, farsightedness, and astigmatism. Glasses and contact lens are curved to “pre-refract” incoming light to compensate for your personal degree of corneal deformation. Laser surgery actually corrects the shape of cornea itself, eliminating most of all of the visual errors that might otherwise call for corrective lenses.

Precision Orthokeratology

Corneal Reshaping While You Sleep
While you might leap at the thought of permanently correcting vision problems, laser surgery isn’t always the best eye care option. For instance, if you suffer from thin corneas, untreated cataracts, diabetes, certain autoimmune diseases, or a corneal disease called keratoconus, you should avoid laser eye surgery.

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Some of our patients simply don’t like the idea of any kind of surgery, or they want a reversible procedure. Precision Orthokeratology (POK) may be an ideal choice for these individuals. Dr. Sumner will map the shape of your corneas precisely and then fabricate special contact lenses. Unlike standard contacts, you’ll wear these lenses at night. The lenses perform a subtle corneal reshaping as you sleep, meaning that you can take them out the next morning and enjoy perfect or near-perfect vision.

POK can help you see clearly for one or two days at a time, or possibly even longer. By wearing them regularly at night, you can maintain your clarity of vision for as long as you decide to continue using them. If you decide to use another form of vision correction, simply stop wearing the POK lenses and your corneas will assume their previous shape once again. Talk with Dr. Sumner to see whether POK is right for you.

Computer Vision

Computer Vision

Squinting at computer, tablet, or mobile screens for hours at a time is a normal part of our lives in the 21st century. Unfortunately, eye problems associated with this activity are also on the rise. Even if you have never had eye problems before, you may have noticed computer vision syndrome symptoms after two or more hours of screen time.

Signs of Computer Vision
Signs include:

  • Blurry vision
  • Eye strain and discomfort
  • Headaches
  • Dry, scratchy eyes
  • Neck and/or shoulder pain

Even if your symptoms are mild, they can worsen and cause other vision problems if not addressed. Our optometrist, Dr. Sumner, can help.

Diagnosis and Treatment of Computer Vision Syndrome

The severity and length of computer vision syndrome symptoms depends on how long you stare at the computer, your posture, lighting, glare, the angle of the monitor, and whether or not you have other diagnosed or undiagnosed vision problems. If you already suffer from astigmatism, farsightedness, presbyopia, aging eyes, and/or diabetic eye problems, your computer vision symptoms may worsen. This can even be the case if you already have prescription contacts or glasses. Many regular eyeglasses and contact lenses are not designed to deflect the problems caused by computer screens.

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Dr. Sumner will take your symptoms, pre-existing conditions, and potential undiagnosed conditions into account as he performs the following eye tests:

  • Visual acuity—Measures the quality of your current vision.
  • Refraction—Tests the potential lens prescriptions that would optimize your vision.
  • Focus and Eye Coordination—Tests how well your eyes work together and how quickly and accurately your eyes can focus on objects and varying distances.

From these measurements, Dr. Sumner can design a treatment plan to help relieve your symptoms. For people with otherwise normal eyes and vision, a set of specially designed glasses used during the time you are working on the computer can be very helpful. For patients already wearing contacts or glasses, new, more computer-friendly prescriptions are available. In addition to these treatment options, there are many things we can suggest cutting down on computer eye strain problems:

  • Computer setup—Adjust your monitor so that it is about 15-20 degrees lower than your eye level when seated between 20-28 inches away from the screen. Reference materials can be placed on a document holder between the monitor and keyboard, or to the side, but positioned for as little head movement as possible. Also invest in an anti-glare screen for your monitor to help reduce glare from surrounding lights. Be sure to sit and work with proper posture.
  • Adjust Lighting—If you can, reposition any lighting (or your computer) to minimize glare and use natural lighting whenever possible.
  • Eye Rest and Blinking Breaks—Every 20 minutes during your work, look away toward a distant point for 20 seconds to refocus your eyes, and give them a 15-minute break after each 2-hour computer session. Also remember to blink more frequently to keep your eyes moist.

With a combination of the proper optometry care and self-care, you can minimize computer eye syndrome and other modern-day vision problems. Contact us for an appointment today.


What is Keratoconus?

There are hundreds of different eye conditions that you might suffer from. Some are hereditary and others are simply the result of the way you live your life. That being said, keratoconus is a hereditary disease in which the cornea of the eye, which is normally round, tends to become cone shaped and bulges out of the normal shape. This bulge makes it difficult for light to enter the eye and reach the retina. Since the eye cannot properly take in light, this disorder causes distorted vision which can make day to day life more difficult. This doesn’t usually cause total blindness but it can cause issues with vision. This is a disorder that gets worse over time and that does change your overall eye shape so that you may not be able to use normal contact lenses.

Keratoconus Treatment

There is currently no treatment for keratoconus as it is a lifelong disease that can get worse the longer you have it. For very serious cases you can get a procedure called corneal cross linking that helps to stabilize the cornea and reduce thinning to make your cornea more stable.

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Though this is not a cure, it can help to keep the disease from getting worse. You can also use contact lenses or glasses to correct the poor vision that is caused by the keratoconus so that you can go about your day to day. If you have this disease or suspect that you might, it is always best to see an optometrist about what types of treatment you can have and what can be done to help make managing your disorder easier.

As with any eye disease or disorder, it is always best that you are under the supervision of an optometrist to make sure that your eyes are cared for and that if there are any changes in your eyes your optometrist can chart them and determine what the best course of treatment is. This is a disease that there currently is no cure for so taking the time to see an optometrist and find the best way to manage your disease is going to be the easiest way to deal with keratoconus and the effects that it produces in the eye.


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