Purchase this article with an account.
Antonio Maria Fea, Vittoria Aragno, Cristina Briamonte, Federico M Grignolo; One month rotational stability of a new collagen toric IOL (Staar Surgical) determined with the protractor photographic system. Invest. Ophthalmol. Vis. Sci. 2014;55(13):4196.
Download citation file:
© ARVO (1962-2015); The Authors (2016-present)
15-22% of the population’s astigmatism is higher than 1,5 D. Recently, due to better phacoemulsification techniques, several toric IOLs (Hydrophobic, Hydrophilic and Silicon) have been implanted. Recently a new collamer toric IOL (Staar Surgical) has been introduced in countries out of the US. We evaluated the rotational stability of the NanoFlex toric Collamer Single Piece IOL using a photographic software (Protractor).
The nanoFLEX™ toric IOL (STAAR) has been implanted in 14 eyes of 14 patients (9 men, 6 women, mean age 72 years) with a topographically determined astigmatism higher than 1,5 D by a single surgeon (AF) with a 2.2 mm incision placed at 11 o’ clock. The patients’ anterior segment was photographed using a Haag-Streit system in retro-illumination at 1 week and 1 month postoperatively. Diffuse light was used to identify the course of conjunctival vessels in order to correctly align subsequent photographs. The axis of the IOL identified by 6 positioning marks was evaluated using the protractor system. Best-corrected visual acuity (BCVA) was measured using ETDRS charts. The astigmatism was estimated by the cylinder which resulted in the best-corrected visual acuity. One sample two-tails t-test was used to compare the data (SPSS program)
The mean axis rotation was 0,72± 0,85 degrees (range 0,1-2,5) and 0,48± 0,32 degrees (range 0,1-0,8) at 7 days and one month post-operatively (p=0,4). BCVA pre-operatively was 0,4 ± 1,1 and 0,8 ± 2,4 (p<0,01). Pre-operative astigmatism was 2,13 ± 0,2 D pre-operative and 0,88±0,4 D post-operative (p<0,01).
Rotational stability of toric IOL has been reported to be 2,5 to 4 degrees in the early post-operative period for acrylic (hydrophylic and hydrophobic) and silicon IOL. The rotational stability of the collagen toric IOL compares favorably well with currently available toric IOLs.
This PDF is available to Subscribers Only