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Vision Therapy for Anisometropia

What is Anisometropia?

Anisometropia is a condition in which the eyes have significantly different refractive power: One eye sees very well while the other doesn’t. This discrepancy causes the brain to receive two very different images, resulting in eye strain, squinting, and headaches. Anisometropia can lead to a serious condition, amblyopia, also known as “lazy eye,” that causes the brain to compensate for the imbalance by essentially ignoring one eye and seeing solely with the other eye.

When the brain ignores one eye, communication between that eye and the brain becomes much weaker — a problem that should be addressed immediately by contacting Dr. Ben Giddens, Dr. Andrea Kozma and Dr. Stephanie Britton.

Anisometropia can result from:

  • A large difference in the optical prescription between the two eyes
  • Strabismus, with the eyes not aligning properly
  • Accommodation difficulties, with one eye doing more of the focusing
  • Ptosis, when the upper eyelid droops and blocks vision
  • Diseases affecting the eyes or surrounding ocular structures
  • A detached retina

It also can occur when the eyes are not the same size, shape, or curvature. As a result, when a person stares at an object, each eye perceives the object as a different size, causing it to appear blurry.

What Can be Done About Anisometropia?

If the visual acuity difference between the two eyes vary widely, this may not be correctable with eyeglasses. However, contact lenses may prove to be more effective as they sit directly on the eyes. LASIK surgery also is an option.

During childhood, anisometropia is best addressed through vision therapy, which is a personalized regimen of exercises managed by Dr. Ben Giddens, Dr. Andrea Kozma and Dr. Stephanie Britton. Vision therapy for children with anisometropia might include the following:

  • Customized exercises to stimulate the brain’s connection with the weaker eye
  • Wearing a patch over the favored eye so the patient has no choice but to see with the weaker eye
  • Wearing prisms while doing homework, watching TV, or playing video games
  • Eye drops that temporarily blur the favored eye, again leaving no option but to rely on the weaker eye.

Giddens Optometry provides vision therapy for those with anisometropia from Georgetown, Limehouse, Acton, Halton Hills, and throughout Ontario.



Please note that we will be open regular hours throughout the provincial lockdown that is set to start on December 26th. We and are keeping a close watch on safety measures!

There is a growing consensus that airborne virus is the biggest source of infection so we are maintaining a limit on the number of people allowed in our offices at any one time. Masks will continue to be mandatory and we will have our ventilation fans on at all times to maintain air circulation. We continue to keep a strict disinfection policy in place

Please click here to read our new protocols.

We encourage you to call or email us to book an appointment for an eye exam or eyewear purchase, in order to prevent any over crowding. We appreciate your understanding and cooperation and look forward to seeing you soon!