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A preliminary study to compare the prediction error of postoperative refraction in paediatric cataract surgery between 2 different intraocular lens power calculation formulas

The treatment of paediatric cataracts has progressed tremendously in the past 15 to 20 years. There is a growing trend towards intraocular lens implantation in infants and younger children whose eyes are still undergoing rapid growth and refractive changes. Objective This study is intended to as...

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Main Author: Azlyn Azwa, Jasman
Format: Thesis
Language:English
Published: 2008
Subjects:
R Medicine (General)
Online Access:http://eprints.usm.my/51585/1/DR.%20AZLYN%20AZWAN%20JASMAN%20-%2024%20pages.pdf
http://eprints.usm.my/51585/
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spelling my.usm.eprints.51585 http://eprints.usm.my/51585/ A preliminary study to compare the prediction error of postoperative refraction in paediatric cataract surgery between 2 different intraocular lens power calculation formulas Azlyn Azwa, Jasman R Medicine (General) The treatment of paediatric cataracts has progressed tremendously in the past 15 to 20 years. There is a growing trend towards intraocular lens implantation in infants and younger children whose eyes are still undergoing rapid growth and refractive changes. Objective This study is intended to assess the predictability of desired refractive outcomes at 3 month postoperative period in paediatric patients undergoing cataract surgery with primary placement of an intraocular lens. Methodology : This randomized interventional study of 31 eyes (24 patients) that successfully underwent cataract surgery and intraocular lens implantations. All patients were 12 years old and below. Intraocular lens power calculations were made using either SRK II or Modified Formula For Paediatric IOL Calculation. The postoperative refractive outcome was taken as the spherical equivalent of the refraction at 3 month postoperative follow-up. The prediction error was taken as the absolute difference between the predicted and the actual refraction. The data were analysed to compare the mean prediction error between SRK II and Modified Formula and evaluate the predictability. Results : The mean prediction error in the SRK II group was 1.03 (0.69) D while in Modified Formula 1.14 (1.19) D. The SRK II group showed lower prediction error of 0.11 D compared to Modified Formula group, but this was not statistically significant XIV (p > 0.05). 18.75% eyes in SRK II group achieved good predictability i.e. the refraction postoperatively was within± 0.5 D from predicted refraction compared to 46.67% eyes in the Modified Formula group. However the difference of the predictability between the two fonnulas was also not statistically significant. Conclusion We would like to conclude that the predictability of postoperative refraction in paediatric cataract surgery is comparable between Modified Formula and SRK II fonnula. The existence of the Modified Fonnula provides an alternative to the ophthalmologist for intraocular lens calculation in paediatric patients. 2008 Thesis NonPeerReviewed application/pdf en http://eprints.usm.my/51585/1/DR.%20AZLYN%20AZWAN%20JASMAN%20-%2024%20pages.pdf Azlyn Azwa, Jasman (2008) A preliminary study to compare the prediction error of postoperative refraction in paediatric cataract surgery between 2 different intraocular lens power calculation formulas. Masters thesis, Universiti Sains Malaysia.
institution Universiti Sains Malaysia
building Hamzah Sendut Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Sains Malaysia
content_source USM Institutional Repository
url_provider http://eprints.usm.my/
language English
topic R Medicine (General)
spellingShingle R Medicine (General)
Azlyn Azwa, Jasman
A preliminary study to compare the prediction error of postoperative refraction in paediatric cataract surgery between 2 different intraocular lens power calculation formulas
description The treatment of paediatric cataracts has progressed tremendously in the past 15 to 20 years. There is a growing trend towards intraocular lens implantation in infants and younger children whose eyes are still undergoing rapid growth and refractive changes. Objective This study is intended to assess the predictability of desired refractive outcomes at 3 month postoperative period in paediatric patients undergoing cataract surgery with primary placement of an intraocular lens. Methodology : This randomized interventional study of 31 eyes (24 patients) that successfully underwent cataract surgery and intraocular lens implantations. All patients were 12 years old and below. Intraocular lens power calculations were made using either SRK II or Modified Formula For Paediatric IOL Calculation. The postoperative refractive outcome was taken as the spherical equivalent of the refraction at 3 month postoperative follow-up. The prediction error was taken as the absolute difference between the predicted and the actual refraction. The data were analysed to compare the mean prediction error between SRK II and Modified Formula and evaluate the predictability. Results : The mean prediction error in the SRK II group was 1.03 (0.69) D while in Modified Formula 1.14 (1.19) D. The SRK II group showed lower prediction error of 0.11 D compared to Modified Formula group, but this was not statistically significant XIV (p > 0.05). 18.75% eyes in SRK II group achieved good predictability i.e. the refraction postoperatively was within± 0.5 D from predicted refraction compared to 46.67% eyes in the Modified Formula group. However the difference of the predictability between the two fonnulas was also not statistically significant. Conclusion We would like to conclude that the predictability of postoperative refraction in paediatric cataract surgery is comparable between Modified Formula and SRK II fonnula. The existence of the Modified Fonnula provides an alternative to the ophthalmologist for intraocular lens calculation in paediatric patients.
format Thesis
author Azlyn Azwa, Jasman
author_facet Azlyn Azwa, Jasman
author_sort Azlyn Azwa, Jasman
title A preliminary study to compare the prediction error of postoperative refraction in paediatric cataract surgery between 2 different intraocular lens power calculation formulas
title_short A preliminary study to compare the prediction error of postoperative refraction in paediatric cataract surgery between 2 different intraocular lens power calculation formulas
title_full A preliminary study to compare the prediction error of postoperative refraction in paediatric cataract surgery between 2 different intraocular lens power calculation formulas
title_fullStr A preliminary study to compare the prediction error of postoperative refraction in paediatric cataract surgery between 2 different intraocular lens power calculation formulas
title_full_unstemmed A preliminary study to compare the prediction error of postoperative refraction in paediatric cataract surgery between 2 different intraocular lens power calculation formulas
title_sort preliminary study to compare the prediction error of postoperative refraction in paediatric cataract surgery between 2 different intraocular lens power calculation formulas
publishDate 2008
url http://eprints.usm.my/51585/1/DR.%20AZLYN%20AZWAN%20JASMAN%20-%2024%20pages.pdf
http://eprints.usm.my/51585/
_version_ 1725973333305982976
score 13.211869

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