April 2014
Volume 55, Issue 13
Free
ARVO Annual Meeting Abstract  |   April 2014
One month rotational stability of a new collagen toric IOL (Staar Surgical) determined with the protractor photographic system
Author Affiliations & Notes
  • Antonio Maria Fea
    Ophth/I Clinica Oculistica, Universita di Torino, Torino, Italy
  • Vittoria Aragno
    Ophth/I Clinica Oculistica, Universita di Torino, Torino, Italy
  • Cristina Briamonte
    Ophth/I Clinica Oculistica, Universita di Torino, Torino, Italy
  • Federico M Grignolo
    Ophth/I Clinica Oculistica, Universita di Torino, Torino, Italy
  • Footnotes
    Commercial Relationships Antonio Fea, None; Vittoria Aragno, None; Cristina Briamonte, None; Federico Grignolo, None
  • Footnotes
    Support None
Investigative Ophthalmology & Visual Science April 2014, Vol.55, 4196. doi:
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      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.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract
 
Purpose
 

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).

 
Methods
 

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)

 
Results
 

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).

 
Conclusions
 

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.

 
Keywords: 567 intraocular lens • 428 astigmatism • 743 treatment outcomes of cataract surgery  
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