Abstract
Purpose
To measure optic shift (OS) of a single piece monofocal intraocular lens (IOL) with varying relationships between anterior capsule cover and IOL optic.
Methods
This is a prospective randomized masked study of 150 eyes undergoing phacoemulsification. Eyes received either option: 360o total capsule cover (group I); partial cover (group II); or no cover (group III). OS was calculated as difference in anterior chamber depth after administration of cyclopentolate 1% and pilocarpine 2% on IOLMaster® at separate visits at 6 months follow-up. Subsequently, using retro-illumination photographs, percentage area of capsule cover was calculated. OS within and between groups I and II was analyzed. The impact of one quartile change in area of capsule cover on percentage change in OS was measured for both groups. Unpaired t-test, correlation, and regression were applied.
Results
In groups I, II, and III, mean age of patients was 56.68±6.38, 57.09±7.34, 59.15±6.35 years, respectively; mean OS (mm) was 1.25±0.28, 1.20±0.24; 0.95±0.26 (P=0.013), respectively; and percentage area of capsule cover (%) was 47.35±10.48, 33.83±10.11, 0.16±0.13 (P=0.001), respectively. Mean percentage area of capsule cover in group I vsgroup II was significant (P=0.001). OS was 1.22±0.26 mm in groups I and II (combined) vs0.95±0.26 mm in group III (P=0.004, (0.06, 0.33)). OS in group I vsgroup II was not significant (P=0.46). Correlation coefficient was r=0.38 (P<0.001). With every increment on quartile (a quartile is any of the three values which divide the sorted data set into four equal parts, so that each part represents one-fourth of the sample or population) class of area of capsule cover the OS increased by 0.12 mm.
Conclusion
The OS differed significantly between total and partial cover groups combined vsno cover group.
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This paper was presented in part as a poster at European Society of Cataract and Refractive Surgery 2005, Lisbon. The authors do not have any commercial connection and/or interest in marketing any product, instrument, or piece of equipment discussed in this paper
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Nanavaty, M., Raj, S., Vasavada, V. et al. Anterior capsule cover and axial movement of intraocular lens. Eye 22, 1015–1023 (2008). https://doi.org/10.1038/sj.eye.6702817
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DOI: https://doi.org/10.1038/sj.eye.6702817
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