Posters

Randomised Intra-patient comparison of closed loop and plate haptic toric intraocular lenses in patients with bilateral astigmatism

Poster Details

First Author: E.Law UK

Co Author(s): R. Aggarwal   H. Kasaby   P. Buckhurst              

Abstract Details

Purpose:

To compare visual outcomes and rotational stability following bilateral implantation of toric intraocular lenses (TIOL).

Setting:

BMI Southend Hospital, Westcliff on Sea, UK

Methods:

Prospective intra-subject randomised contra-lateral eye study involving 30 patients. Subjects were implanted with Zeiss AT Torbi 709M (plate haptic) and Rayner T-Flex  (loop haptic). The TIOL implanted to the first eye was randomised according to a 1:1 block randomisation ratio. Subjects were assessed 1 day, 1 week, 1 month and 3 months. UDVA and BCDVA using ETDRS chart. Residual refraction was analysed as Mean Spherical Equivalent (MSE) and the power vector method for cylindrical power. TIOL rotation was measured using dilated images of IOL taken at each visit. Vector analysis was used to determine the efficacy of the toric correction.

Results:

Pre-operatively there were no significant differences (F = 0.01, p = 0.981) between eyes for corneal astigmatism (plate 2.59±0.81; loop 2.38±0.62D), refractive MSE (plate -2.50±4.88, loop -2.53±5.02D), and BCDVA (plate 0.38±0.18, loop 0.33±0.15LogMAR). The surgically induced refractive correction was similar for both TIOLs (plate 2.42±1.26DC, loop 2.38±1.02D). The absolute vector error was lower with the loop haptic (plate 0.61±0.38; loop 0.80±0.37D) in comparison with the plate haptic (p=0.02) and the correction ratio was also better with the loop haptic (p=0.04; plate 0.89±0.25; loop 0.97±0.29) at the 3 month visit.

Conclusions:

Both Zeiss AT Torbi and Rayner toric IOLs provide effective correction of astigmatism and improvement in visual acuity.

Financial Disclosure:

None