Original Research

Sensitivity of the corneal-plane refractive compen- sation to change in power and axial position of an intraocular lens

W. F. Gool, R. D. van Gool
African Vision and Eye Health | South African Optometrist: Vol 68, No 4 | a173 | DOI: https://doi.org/10.4102/aveh.v68i4.173 | © 2009 W. F. Gool, R. D. van Gool | This work is licensed under CC Attribution 4.0
Submitted: 17 December 2009 | Published: 17 December 2009

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W. F. Gool, PhD FRSSAf, South Africa
R. D. van Gool, DPhil, South Africa

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Abstract

If an intraocular lens is displaced or if its power is changed what are the consequences for the refractive compensation of the eye?  Gaussian optics is used to obtain explicit formulae for the sensitivityof the corneal-plane refractive compensation (also called the refraction, refractive state, etc) to change in power and axial displacement of a thin intraocular lens implanted in a simple eye.  In particular, for a pseudophakic Gullstrand simplified eye withintraocular lens placed 5 mm behind the cornea the sensitivity to errors in the power of the intraocular lens is about  71 . 0 − 71 for an intraocular lens of power   for an intraocular lens of power 20 D, that is, the refractive compensation decreases by about 0.71 dioptres per dioptre increase in the power of the intraocular lens.  More generally the sensitivity is approximately  ( ) I m   0037 . 0 63 . 0 F − − 0.63 ( 003 . 0 63 . 0 − − (0.0037m)FI
where FI is the power of the intraocular lens.  Also for Gullstrand’s simplified eye the sensitivity of refractive compensation to axial displacement of the intraocular lens is approximately linear in FI
, about  (64D) FI, in fact.  That is, for each dioptre of the power of the intraocular lens the refractive compensation increases by about 0.064 dioptres per millimetre of axial displacement towards the
retina.


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