Biometry of the silicone oil-filled eye

被引:25
|
作者
Murray, DC [1 ]
Potamitis, T [1 ]
Good, P [1 ]
Kirkby, GR [1 ]
Benson, MT [1 ]
机构
[1] City Hosp NHS Trust, Birmingham & Midland Eye Ctr, Birmingham B18 7QU, W Midlands, England
关键词
axial length; biometry; echography; intraocular lens; silicone oil;
D O I
10.1038/eye.1999.82
中图分类号
R77 [眼科学];
学科分类号
100212 ;
摘要
Purpose The advent of silicone oil tamponade has resulted in improved success rates in complicated retinal detachment surgery. Its use, however, can induce cataract formation in phakic eyes. In selected patients, removal of silicone oil can be combined with phacoemulsification of the cataract and intraocular lens (IOL) implantation, thus avoiding a further operation. This, however, poses a problem when trying to decide the power of IOL to be used, since the echographically measured axial length (AL) of an eye is greater in the presence of silicone oil. We performed ultrasound examination in the presence of silicone oil of viscosity 1300 centistokes, in order to determine whether the measured AL varied from the true AL by a constant factor. Methods The ALs of 7 phakic eyes were measured by A-mode echography, with and without silicone oil of viscosity 1300 centistokes in the posterior segment. The retina was attached in all cases. The control group consisted of 6 phakic eyes with attached retinae undergoing vitrectomy without the use of silicone oil. The ALs in the control group were measured before and after vitrectomy. Results The mean ratio of true AL to measured AL in the presence of silicone oil was 0.71 (standard deviation 0.01; range 0.70-0.73; median 0.71) in the 7 eyes in this study. In the control group, vitrectomy appeared to have no significant effect on AL. Conclusions We have established a constant which corrects for the apparent increase in AL induced by silicone oil of viscosity 1300 centistokes. This conversion factor, when used in existing biometry formulae (SRK/T), allows estimation of the power of IOL required in eyes undergoing combined cataract extraction, removal of silicone oil and lens implantation.
引用
收藏
页码:319 / 324
页数:6
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