High order phase difference such as smear caused by myopic surgery

myopia 、 hyperopia 、 astigmatism 、 glare 、 Aging belongs to the low-order phase difference in the above figure .

The low order difference is Zernike Pyramid The first two layers of

Higher order phase difference is Zernike Pyramid The third floor of and after

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first floor ： born （ Without genetic myopia ）

The second floor ： Eye fatigue leads to

The third level ： High order difference caused by myopia surgery

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No matter how to do myopia surgery , These are all above. Zernike Pyramid Any image on the third layer and below , If you want a second myopic surgery , Only from the above Zernike Pyramid Jump from one image of to another , With the nature of gambling .

Ophthalmologists belong to eye surgery , Only skilled in operating instruments , But I don't know the nature of the principle .

Myopic surgery is computer-controlled , Computer related theories are inherently probabilistic , Is not 100% Guarantee success .

Everyone will have Zernike Pyramid A variety of visual images in .

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Surgical sequelae 、 The solution after failure ：

Find the astigmatism diagram , Towards the shadow （ Gray line ） And real shadow （ Black line ） Massage the muscles around the eyeball in the overlapping direction to coincide , Can effectively alleviate .

 

Reference:

Different aberrations raise contrast thresholds for single-letter identification in line with their effect on cross-correlation based confusability-Laura K. Young,Gordon D. Love,Hannah E. Smithson