Re: [OM] How does it look?

[usher99--- via olympus]

Wayne writes:
<<Mike, interesting observation on CA as I've just had cataract surgery on
<<second eye this morning.  Do you have a good reference on the resultant
<<visual effects of this surgery?

I hope all went well. IOL exchanges are a pain.
 The use of spherical aberration or other techniques to extend the depth of 
field for IOL's (Intraocular lens) informs the IOL choice and not much to do 
after if the refractive targets were hit and you are happy. 
 On the other hand for someone with large pupils who drives at night frequently 
cancelling out the corneal pos SA  with an aspheric monofocal IOL may have an 
advantage to maximize contrast sensitivity at the cost of very narrow dof. 
Rayone EMV IOL uses modest pos SA in the center with a rapid taper to slightly 
neg SA towards periphery to extend the dof about 1.5 diopters.  Truly 
accommodating IOL's with no downside (except expense of course)  are in the 
works but it will be a few years. Eyhance IOL uses a small amount of neg SA  
but it buys only 0.4D or so on average of extended dof.  It does perform well 
in patients with largish pupils as the MTF doesn't plummet as it cancels out 
the corneal pos SA. Clear vision, Mike

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