Scientific Studies on Lazy Eye

Scientific research has provided many beneficial breakthroughs in the way we understand and treat a lazy eye.

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What is a lazy eye?

Approximately 2-3% of American children have amblyopia, which is the medical term for a lazy eye. It is the main cause of loss of vision in children in one eye. Amblyopia is a condition that occurs when the eyes are not working together properly as a team along with the brain. Each eye is receiving its own image which is not coordinated with the other so in order to cope, the brain shuts off communication with one eye, nicknamed the ‘lazy eye’ by suppressing it. Clear vision is achieved by the other, stronger eye as the lazy eye cannot achieve 20/20 vision, even with an optical correction.

 

Studies on Treatment for Lazy Eye

It is important to understand what the standard method of treating a lazy eye used to be. The approach was generally to promote as much patching as possible. Patching means to close off the strong eye in order to force the lazy eye to step up and communicate with the brain in order to achieve clear vision. In addition, it was believed that patching was no longer effective after the critical time period of development, which is somewhere between the ages of six and nine so there was a rush to begin patching as early as possible. In addition to patching, it’s important to also provide an accurate optical correction. Since there used to be value to patching as early as possible, the patient would receive the appropriate optical correction and begin patching as soon as possible, often simultaneously.

Pediatric Eye Disease Investigator Group (PEDIG)

A group of optometrists and ophthalmologists, known as the Pediatric Eye Disease Investigator Group (PEDIG) are funded by the National Eye Institute to do clinical research on various pediatric eye conditions. Most of their research has focused on treatment for amblyopia in children and adolescents and comparing various methods to find the most effective strategy. These studies have come to be known as the Amblyopia Treatment Studies (ATS) which have greatly improved the way that eye care health providers are treating a lazy eye.

 

Amblyopia Treatment Studies (ATS)

The results of the ATS research have made a huge impact on how we treat amblyopia today. There are different elements to the overall treatment which will be discussed in further detail below.

  • Optical Correction: The accepted method of treatment is now to first provide the patient with an accurate optical correction. After 6-8 weeks of the patient wearing the new prescription glasses, a follow up appointment is scheduled. Some children will not need anymore treatment once they have been wearing the proper glasses. At this follow up appointment, the optometrist will decide if the child does need more treatment in addition to wearing the accurate prescription. If further treatment is required, the child is now at an advantage because he or she has clearer vision which allows for better compliance in the following steps.
  • Patching: For patients who require more treatment, the next step is occlusion therapy, or patching. A fascinating result of the study is the research that proved that two hours of patching daily in children with moderate amblyopia yielded the same results as patching for six hours a day. For children with severe amblyopia, six hours a day proved to be just as effective as a full day of patching. Also, there were children with severe amblyopia who had great results from just 2 hours of daily patching. In conclusion, we have clinical proof that less patching than what was practiced previously yields effective results and helps tremendously with compliance. It is important that no matter how long the patient is told to close the strong eye, one hour of patching should involve activities from a close up distance in order to stimulate the visual system.
Studies on Recurrence

Studies on Recurrence

Research has shown that approximately 20% of children who complete treatment for a lazy eye, will have the condition return. Therefore, it’s very important that even after treatment is completed, the patient is scheduled for follow up appointments to ensure proper monitoring.

In order to reduce the likelihood of recurring amblyopia, it is essential to provide the proper plan for ending treatment. Instead of abruptly ending the treatment, it is beneficial to progressively end by tapering down the treatment method.

Common Questions

Medicated eye drops which blurs vision when applied to the eye is used as an alternative to patching. The strong eye is blurred out using these eye drops, forcing the lazy eye to learn to work properly with the brain in order to provide clear vision. The drops are only obtained by prescription from a healthcare provider. It is important that all potential side effects are explained before using this type of eye drop. In addition to blurring vision, these eye drops can cause stinging and other such discomfort which makes compliance more challenging. The PEDIG research made a breakthrough in proving that for a moderate to severe case of lazy eye, using eye drops only on the weekends provides the same benefits as daily administration.
Yes, lazy eyes can be treated for adults as well, not only children. There used to be a widespread misconception that after a child passes a particular age of development, believed to be approximately between ages six and nine, treatment for a lazy eye would no longer be effective. Thanks to scientific research, most notably that of the works of Levi, Li and colleagues, we now know that a lazy eye can be treated even in adulthood.
Scientific Studies on Lazy Eye
Dr. Wernick cartoon

Summary

If you have any questions regarding a lazy eye, please don’t hesitate to call  (212) 752-6930 to schedule a consultation at our office, Amplify EyeCare Manhattan. Dr. Nathaniel Wernick and staff have a lot of experience diagnosing and treating a wide range of eye conditions and will be happy to discuss and answer any questions you have.

Testimonials


  • At Amplify with Dr Wernick I was seeking help for seemingly intractable, probably age-related dryness. I've seen other doctors about it, and that has been helpful, but what he explained to me about it and the careful way he answered all my questions gave me so much more of a clear understanding of what is going on (and is not) that I am more able to implement all his and others' recommendations than I was before. And he gave me additional resources for further follow-up. I am most grateful.


    Cynthia Norton

  • Wow! This is a great Eye Care medical facility. I was thoroughly examined by Dr. Pinkhasov for over 2 hours. She made sure to check my eyes for pretty much everything and patiently explained proper care for my eyes. They definitely know how to provide great care and treat their patients right. Now I know why they have such a great reputation and been around for so long.


    Steve Fay

  • Dr. Kavner is a gifted diagnostician and orthoptic therapist. He treated me several decades ago for a condition similar to dyslexia. I was having migraines five times per week. I worked with him for about a year and I experienced tremendous improvement (down to 3-4 per year) that has lasted.


    Mary K.

  • Dr. Kavner recommended two types of eye therapy for my daughter. One of them using bio-feedback. In just three sessions she is seeing considerably better. She shouted this morning: Ooh my God! I could not see these letters with my glasses on, and now I can see them without my glasses. If you are willing and able to invest in improving your vision, this is a good place to go to!


    Peter G.

  • Dr. Kavner recommended two types of eye therapy for my daughter. One of them using bio-feedback. In just three sessions she is seeing considerably better. She shouted this morning: Ooh my God! I could not see these letters with my glasses on, and now I can see them without my glasses. If you are willing and able to invest in improving your vision, this is a good place to go to!


    Kinkie F.

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