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6/10 improvement in three months

FAQ n. 44. Power Vision System - A year ago I underwent PRK surgery in both eyes as to correct 7 D myopia and astigmatism. Now, a year later, I’m still a myope—about 1 D on my right eye (which has always seen less than the dominant left one). After the analysis (corneal topography, and soon), we understood that my myopia is the accommodative type. With my surgeon’s approval, about three months ago, I started training five days a week, with positive lenses only on my right eye (+1, +1.25, +1.50). In the beginning I hardly read 3/10 on Snellen tables. Now, though it isn’t easy, I get 9/10. In spite of these very good results, my right eye vision is still unclear. Am I doing everything correctly?



- Answers David De Angelis

I think that your results speak for themselves. 6/10 improvement in three months is a more than great result, even if your last improvement isn’t stable yet.

Passing from +1 to +1.25 and then to +1.50, you’ve respected load/stimulus increase, the gradual retinal defocus increasing with lenses through the CRB system. You’ve got the response of your refractive capability and consequently better focusing.

I think you were very lucky because after laser surgery your myopia is still the “accommodative” type. In the opposite case (if your cornea were deformed), the Power Vision System wouldn’t help you at all since it acts over extrinsic ocular muscles, the state of tonic accommodation of the ciliary muscle, and the level of central fixation, but not over corneal geometry and its curving. If the surface of a camera lens is damaged, it is useless to work on the focusing system; it’s necessary to repair the lens itself. Since your lens, your cornea after corneal topography, is still good, you can obviously intervene over the focusing system directly, as any other person would.


Keep going this way, which has brought you a 6/10 improvement in three months, and keep going, giving a constant increase of defocus in the eye that needs it. Keep going this way as long as your focusing capability is being increased (when necessary, pass to +2, +2.25).

Any adaptation always follows a gradual stimulation. Listen to your ophthalmologist’s advice. She knows everything about your case and can make the right medical diagnosis.




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