Diopters for long distance vision in iol for catraracts

[arnie71]

I have iol for cataracts of 20.0 D and 21.0 D. Are they for long distance vision? I don't see well at a distance post opreation.

[Houman Vosoghi, MD]

Nope.  Can't do those calculations.  The IOL could be considered at the nodal point of the eye.  Need to know what the surgeon aimed for with a much more complicated calculation that takes the lenght of your eye, corneal measurements, and lens A constant into account.

HV

[arnie71]

I will check with my Dr.

From my limited knowledge of optics, I have taken the reciprical of 20 diopters and get 0.05 meters which is 5 cm for a focal length. That does not seem good for distance vision. I am probably simplifying this issue too much. The IOL cards give a length of 13.0 mm and a optic of 6.0 mm if that is any help.

[Houman Vosoghi, MD]

Depends on your measurements.  Knowing the lens info tells us nothing about your eyes and what lens was needed for distance.  Find out what your distance correction is now and I can tell you if they aimed for distance or near.

HV

[arnie71]

I will find out. I have an apponitment on Mar. 18, 2011.