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The Shape of Your Eyes Affects Your Vision | Long Island Eye Doctor

Joel Kestenbaum, OD

There are so many factors determining the quality of one’s vision.  Some factors are nearsightedness (myopia), farsightedness (hyperopia), astigmatism (oval eyes), blue eyes, dark eyes and eye shape.  One would never think that the shape of the eyes can affect one’s vision, but it does.  What do I mean by shape?

  • There is the shape of the front surface of the eye (the cornea).
  • There is the shape (or size) of the pupils.  These are this black holes in the center of our eyes through which light passes
  • There is the shape of the structure of the eyelids.

The cornea is like the front lens on a camera.  When light passes through it, it is directed or refracted to focus on the back of the eye called the retina.  If the cornea has an irregular shape, the light will not focus clearly.  An astigmatism is a condition where the cornea has an oval or elongated shape, like a football instead of a baseball.  Light distorts and a person sees blurry.  Dry eyes can also cause the cornea to be irregular in shape and to distort the light going to the back of the eye.

The size of the pupil of the eye has a lot to do with the quality of vision, as does the amount of light in the room.  If we assume normal daylight, a person with smaller pupils will generally see better than someone with larger pupils.  I always assume that a person is wearing their best eyeglass or contact lens correction when I talk about vision quality.  Have you ever been in a situation where you had to shield your eyes or look through a small hole to see more clearly?  What you are doing is actually letting in only the light that is going through the center of your pupils, effectively making a smaller pupil.  People with larger pupils tend to get more glare and as a result, their vision quality is reduced.

The shape of the eyelids can also be a big factor in your vision.  Someone with very large eyes might have excellent vision, but it is more likely that their vision would be worse than someone with narrow eyes.  The same reasons apply like the person with large pupils.  Large eyes equal more glare.  More glare means a lesser visual function.

 Sunglasses are highly recommended for everyone, but for those with large eyes and/or large pupils, sunglasses are a necessity for both vision and protective purposes.  Ask your eye care professional about how you can improve your overall visual well-being or give our knowledgeable staff a call.  We will be happy to answer any questions you may have.


Dr. Joel Kestenbaum

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