Abstract
Purpose To assess the degree of accuracy of postoperative refraction that may be achieved with modern techniques and a new lens of modern design.
Methods Five hundred eyes underwent refraction at one week and one month following phacoemulsification and implantation of the Centerflex lens (Rayner Intraocular Lenses Ltd style 570H). Results were compared with the target that had been computerised at the time of surgery, using the Hoffer Q formula for axial lengths less than 22.0 mm, the SRK-T for lengths greater than 24.5 mm and a mean of the two formulae for lengths between 22.0 and 24.5 mm. Statistical analysis used Fisher’s exact and one way ANOVA tests.
Results At one month 97% of refractions were within 1.0 D spherical equivalent (SE) of target and 81% within 0.5 SE. The mean absolute error was 0.37 ± 0.39 SD. 75.8% of all eyes achieved 6/12 unaided and 88.6% achieved 6/9 with correction. In only 1.2% the refraction between one week and one month had altered by 0.5 D or more.
Conclusions The Centerflex when combined with modern methods of power calculation, can be associated with a high degree of accuracy in postoperative refraction.
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References
Percival P . Update on foldable lens implants. South Af J Implant Refr Surg (in press)
Stenevi U, Lundstrom M, Thorburn W . An outcome study of cataract surgery based on a national register. Acta Ophthalmol 1997; 75: 688–691
Holladay JT . Standardising constants for ultrasonic biometry, keratometry and intraocular lens power calculations. J Cataract Refract Surg 1997; 23: 1356–1370
Percival SPB . Five year follow up of a prospective study comparing Hydrogel with PMMA single-piece lenses. Eur J Implant Refract Surg 1994; 6: 10–13
Nishi O, Nishi K . Preventing posterior capsule opacification by creating a discontinuous sharp bend in the capsule. J Cataract Refract Surg 1999; 25: 521–526
Nishi O, Nishi K, Akura J, Nagata T . Effect of round edged acrylic intraocular lenses on preventing posterior capsular opacification. J Cataract Refract Surg 2001; 27: 608–613
Farbowitz MA, Zabriskie NA, Crandall AS, Olson RJ, Miller KM . Visual complaints associated with the Acrysof acrylic intraocular lens. J Cataract Refract Surg 2000; 26: 1339–1345
Erie JC, Bandhauer MH, McLaren JW . Analysis of postoperative glare and intraocular lens design. J Cataract Refract Surg 2001; 27: 614–621
McLoone E, Mahon G, Archer D, Best R . Silicone oil intraocular lens interaction: which lens to use?. Brit J Ophthalmol 2001; 85: 543–545
Hoffer KJ . The Hoffer Q formula: a comparision of theoretic and regression formulas. J Cataract Refract Surg 1993; 19: 700–712
Hoffer KJ . Clinical results using the Holladay 2 intraocular lens power formula. J Cataract Refract Surg 2000; 26: 1233–1237
Sanders DR, Retzlaff JA, Kraff MC, Gimbel HV, Raanan MG . Comparison of the SRK-T formula and other theoretical and regression formulas. J Cataract Refract Surg 1990; 16: 341–346
Schwenn O, Kottler U, Krummenauer F et al. Effect of large positioning holes on capsular fixation of plate haptic intraocular lenses. J Cataract Refract Surg 2000; 26: 1778–1785
Toldos JJM, Roig AA, Benabent EC . Total anterior capsule closure after silicone intraocular lens implantation. J Cataract Refract Surg 1996; 22: 269–271
Joo CK, Shin JA, Kim JH . Capsular opening contraction after continuous curvilinear capsularhexis and intraocular lens implantation. J Cataract Refr Surg 1996; 22: 585–590
Ursell PG, Spalton DJ, Pande MV . Anterior capsule stability in eyes with intraocular lenses made of poly(methylmethacrylate), silicone and Acrysof®. J Cataract Refract Surg 1997; 23: 1532–1538
Gonvers M, Sickenberg M, van Melle G . Change in capsulorhexis size after implantation of three types of intraocular lenses. J Cataract Refract Surg 1997; 23: 231–238
Werner L, Pandey SK, Escobar-Gomez M et al. Anterior capsule opacification: a histopathological study comparing different intraocular lens styles. Ophthalmology 2000; 107: 463–467
Hayashi K, Hayashi H, Nakao F, Hayashi F . Reduction in the area of the anterior capsule opening after polymethylmethacrylate, silicone and soft acrylic intraocular lens implantation. Am J Ophthalmol 1997; 123: 441–447
Desai P, Minassian DC, Reidy A . The National Cataract Survey 1997/98: a report of the results of clinical outcomes. Brit J Ophthalmol 1999; 83: 1336–1340
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Paper read in part at the Annual Meeting of Royal College of Ophthalmologists, 2001
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Percival, S., Vyas, A., Setty, S. et al. The influence of implant design on accuracy of postoperative refraction. Eye 16, 309–315 (2002). https://doi.org/10.1038/sj.eye.6700043
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DOI: https://doi.org/10.1038/sj.eye.6700043
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