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Prospective evaluation of a plate haptic toric intraocular lens
M Leyland1, E Zinicola, P Bloom
1Hillingdon Hospital NHS Trust, Uxbridge, UK.
Purpose:
Standard intraocular lenses (IOL) only correct the spherical component of aphakic refractive error. This study describes clinical experience with a foldable, injectable, toric IOL.
Methods:
Keratometric, refractive and visual data were collected on patients listed for cataract surgery. Toric IOLs were offered where keratometric cylinder was greater than 1.5 dioptres. Small-incision phacoemulsification surgery was performed and the IOL implanted with its long axis along the steep corneal axis. Post-operative refractive data were compared with pre-operative and expected refraction using vector analysis software.
Results:
Results of 22 eyes of 16 consecutive patients implanted with toric IOLs are reported. Two IOLs rotated more than 30 degrees in the first 24 h and were re-dialled surgically. Two further IOLs (9%) rotated more than 30 degrees during follow-up. In 21 of 22 eyes (95%) the refractive astigmatism was reduced, with a mean 73% of planned correction (vector analysis) achieved.
Conclusions:
The toric IOL is a useful surgical tool to reduce the refractive effects of pre-existing corneal astigmatism. Design modification to prevent IOL rotation would make results more predictable.