Rigid contact lens fitting based on keratometry readings in keratoconus patients:predicting formula

AIM:To find a simple mathematical correlation between the lens base curve(BC) and keratometry findings(krf).METHODS:This retrospective study included 400 keratoconic eyes(350 patients) previously fit with rigid contact lenses at an academic eye center over a five year period.The patients were classi...

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Published in:International journal of ophthalmology 2011, Vol.4 (5), p.525-528
Main Authors: Rajabi, Mohammad Taher, Mohajernezhad-Fard, Zahra, Naseri, Seyede Khojaste, Jafari, Fahimeh, Doostdar, Askar, Zarrinbakhsh, Parviz, Rajabi, Mohammad Bagher, Kohansal, Sedigheh
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Clinical Research
fitting
keratoconus
keratometry
lens
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container_end_page 528
container_issue 5
container_start_page 525
container_title International journal of ophthalmology
container_volume 4
creator Rajabi, Mohammad Taher
Mohajernezhad-Fard, Zahra
Naseri, Seyede Khojaste
Jafari, Fahimeh
Doostdar, Askar
Zarrinbakhsh, Parviz
Rajabi, Mohammad Bagher
Kohansal, Sedigheh
description AIM:To find a simple mathematical correlation between the lens base curve(BC) and keratometry findings(krf).METHODS:This retrospective study included 400 keratoconic eyes(350 patients) previously fit with rigid contact lenses at an academic eye center over a five year period.The patients were classified into five groups based on the keratometry findings(krf<7,krf:7-8,krf>8,krf-krs(difference between two keratometry;flat and steep)= 0.3-0.6,krf-krs >0.6mm as groups 1 to 5,respectively.Multivariate linear regression and Munro’s correlation coefficient were employed to defer the formulas.RESULTS:A linear correlation could be found in all groups except for patients in group 3.For group 1,BC=0.211×krf+ 5.904.For group 2,BC=0.456×krf+4.160.For group 4,BC= 0.321×krf+5.219.For group 5,BC=0.337×krf+ 5.090.CONCLUSION:The development of new formulas for RGP fitting enables ophthalmologists to work with confidence and prevents unnecessary and frequent lens trials.The customary lens fitting methods are needed to be replaced by new formulas,which help to save time and costs.
doi_str_mv 10.3980/j.issn.2222-3959.2011.05.13
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Mohajernezhad-Fard, Zahra ; Naseri, Seyede Khojaste ; Jafari, Fahimeh ; Doostdar, Askar ; Zarrinbakhsh, Parviz ; Rajabi, Mohammad Bagher ; Kohansal, Sedigheh</creator><creatorcontrib>Rajabi, Mohammad Taher ; Mohajernezhad-Fard, Zahra ; Naseri, Seyede Khojaste ; Jafari, Fahimeh ; Doostdar, Askar ; Zarrinbakhsh, Parviz ; Rajabi, Mohammad Bagher ; Kohansal, Sedigheh</creatorcontrib><description>AIM:To find a simple mathematical correlation between the lens base curve(BC) and keratometry findings(krf).METHODS:This retrospective study included 400 keratoconic eyes(350 patients) previously fit with rigid contact lenses at an academic eye center over a five year period.The patients were classified into five groups based on the keratometry findings(krf&amp;lt;7,krf:7-8,krf&amp;gt;8,krf-krs(difference between two keratometry;flat and steep)= 0.3-0.6,krf-krs &amp;gt;0.6mm as groups 1 to 5,respectively.Multivariate linear regression and Munro’s correlation coefficient were employed to defer the formulas.RESULTS:A linear correlation could be found in all groups except for patients in group 3.For group 1,BC=0.211×krf+ 5.904.For group 2,BC=0.456×krf+4.160.For group 4,BC= 0.321×krf+5.219.For group 5,BC=0.337×krf+ 5.090.CONCLUSION:The development of new formulas for RGP fitting enables ophthalmologists to work with confidence and prevents unnecessary and frequent lens trials.The customary lens fitting methods are needed to be replaced by new formulas,which help to save time and costs.</description><identifier>ISSN: 2222-3959</identifier><identifier>EISSN: 2227-4898</identifier><identifier>EISSN: 2222-3959</identifier><identifier>DOI: 10.3980/j.issn.2222-3959.2011.05.13</identifier><identifier>PMID: 22553715</identifier><language>eng</language><publisher>China: International Journal of Ophthalmology Press</publisher><subject>Clinical Research ; 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subjects Clinical Research
fitting
keratoconus
keratometry
lens
title Rigid contact lens fitting based on keratometry readings in keratoconus patients:predicting formula
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