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Alternative methodology for intraocular lens characterisation
Author(s) -
Amaral Felipe T,
Lima Monteiro Davies W
Publication year - 2013
Publication title -
ophthalmic and physiological optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.147
H-Index - 66
eISSN - 1475-1313
pISSN - 0275-5408
DOI - 10.1111/opo.12074
Subject(s) - spherical aberration , wavefront , intraocular lenses , computer science , lens (geology) , optics , intraocular lens , optical transfer function , zernike polynomials , physics
Purpose To present an alternative methodology to characterise intraocular lenses ( IOL s) using an optical setup with a H artmann‐ S hack wavefront sensor. Methods The methodology was inspired by the ANSI Z80.30 Standard, which addresses IOL optical properties and test methods, and aims to simplify the procedure to allow complete IOL characterisation with a reduced number of measurement steps. Results Seven spherical and three toric IOL s were characterised with the alternative methodology and by commercial equipment. Three spherical IOL s measured with the alternative methodology obtained dioptric spherical errors larger than the tolerance established by the ANSI Z80.30 Standard when compared to the IOL s theoretical designs, probably due to manufacturing deviations. All cylindrical dioptric power measurements were within the Standard tolerance. The longitudinal spherical aberration of the IOL s were measured and 2‐dimensional Modulation Transfer Functions (MTF) were calculated in order to complementarily assess manufacturing and design quality. Conclusions The alternative methodology allows complete IOL characterisation with a reduced number of steps compared to those required by the Standard ANSI Z80.30, achieving satisfactory results in measurements of IOL dioptric power, spherical aberration, cylindrical power and MTF . Although MTF measurements were not performed with a model eye, they may contain additional relevant information regarding the design of ophthalmic lenses.