Sensitivity of the corneal-plane refractive compensation to change in power and axial position of an intraocular lens
<p>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 sensitivity</p><p>of the corneal-plane refractive compensation (also called the refra...
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| Format: | Article |
| Language: | English |
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AOSIS
2009-12-01
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| Series: | African Vision and Eye Health |
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| Online Access: | http://www.avehjournal.org/index.php/aveh/article/view/170 |
| Summary: | <p>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 sensitivity</p><p>of 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 with intraocular 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 ( ) m 0037 . 0 63 . 0 F − − 0.63 ( 003 . 0 63 . 0 − − (0.0037m)F where FI<br /> 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<br />, in fact. That is, for each dioptre of the power of the intraocular lens the refractive compensation increases by about 0.064 dioptres <br />per millimetre of axial displacement towards the retina.</p><p> </p> |
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| ISSN: | 2413-3183 2410-1516 |