Can you explain the fluctuation of eyeglasses prescription



Submitted by Tay Brown on Tue, 08/13/2019 - 04:17
United States
Did you perform any surgery for the eyes?
Do you suffer from pre-existing illnesses in the eye?
Do you suffer from any diseases in the body?
Do you use any eye drops?
Do you wear Contact lenses or Eyeglasses?





I had a question about the changes in my most recent eye prescription compared to my last prescription from 2 years ago.

The spherical power of my prescription 2 years ago were  -0.25 for right eye and -0.50 for left eye. My most recent eye exam showed that the spherical power for both eyes were zero. Is it possible for eyesight to get better in this way?

The cylinder  axis stayed the same but my cylinder power went from -1.25 in both eyes 2 years ago to -0.75 in both eyes in my most recent prescription. What do these numbers mean? Has my eyesight gotten better?




Thanks for your Question

There are many factors can cause fluctuation of eyeglasses prescription and at your age most likely dry eyes. Tears are very important for the optical system of the eye and any change in the quality and quantity of tears can affect the optical power of the eye.

Another common cause is accommodation during examination. Special muscle inside the eye is called ciliary muscle. Contraction or spasm of this muscle also can alter the prescription power of your eyeglasses.People who want to undergo lasik eye surgery should have pupil dilation with cyloplegic eye drops. Cycloplegic eye drops will also relax the ciliary muscles and the exact refractive power of the eye can be measured.

Other causes of fluctuation of eyeglasses prescription are hormonal changes during pregnancy, cataract and diabetis mellitus.