Analysis of pupil and corneal wave aberration data supplied by the SN CT 1000 topography system

Ocular aberrations depend on pupil size and centring and the retinal image quality under natural conditions differs from that corresponding to laboratory ones. In the present article, pupil and wave aberration data supplied by the Shin Nippon CT 1000 (SN CT 1000) topography system are analysed. Two...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Comastri, Silvia Ana Elba, Martin, Gabriel Norberto
Publicado: 2006
Materias:
Corneal aberrations
Ocular pupil
Data reduction
Ophthalmology
Research laboratories
Wavefronts
Aberrations
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00304026_v117_n11_p537_Comastri
http://hdl.handle.net/20.500.12110/paper_00304026_v117_n11_p537_Comastri
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00304026_v117_n11_p537_Comastri
record_format dspace
spelling paper:paper_00304026_v117_n11_p537_Comastri2023-06-08T14:56:19Z Analysis of pupil and corneal wave aberration data supplied by the SN CT 1000 topography system Comastri, Silvia Ana Elba Martin, Gabriel Norberto Corneal aberrations Ocular pupil Data reduction Ophthalmology Research laboratories Wavefronts Corneal aberrations Ocular pupil Aberrations Ocular aberrations depend on pupil size and centring and the retinal image quality under natural conditions differs from that corresponding to laboratory ones. In the present article, pupil and wave aberration data supplied by the Shin Nippon CT 1000 (SN CT 1000) topography system are analysed. Two groups of eyes under natural viewing conditions are considered ((260±20) lux at the eye under study). The first group consists of 10 normal eyes (-1.25 to 3 D sphere; 0 to -1.75 D cylinder) of five young subjects (age between 18 and 33 years). For this group, five determinations per eye are performed and the repeatability of results is analysed. Pupil centre is displaced from corneal vertex towards the temporal region, the largest displacement being (0.5±0.1) mm. The variation of pupil diameter in each eye is less than 21% while the inter-subject variability is large since diameters are between (3±0.3) and (5.3±0.6) mm. Aberrations are evaluated for two different pupil sizes, the natural one and a fictitious one of 6 mm. The corneal higher-order root-mean square wavefront error (RMSHO) for a 6 mm pupil centred in the corneal vertex, averaged across all eyes, is (0.37±0.06) μm while, considering the natural pupil diameter, the average in each eye is significantly lower, up to eight times smaller. The fourth-order spherical aberration is an important aberration in the considered eyes, its maximum value for a 6 mm pupil being (0.38±0.02) μm. The second group consists of 24 eyes of 12 subjects (age between 25 and 68 years) such that four eyes are of normal adults (1.25 to +6 D sphere; 0 to -0.5 D cylinder), eight have astigmatisms (-5.5 to +3.25 D sphere; -1.5 to -4.5 D cylinder), six have post-refractive surgery (+0.5 to +3.5 D sphere; -0.5 to -4 D cylinder) and six have keratoconus (-9.5 to +1 D sphere; -1 to -4.5 D cylinder). For this group only one determination per eye is performed. Pupil centre is displaced from corneal vertex towards the temporal region except in cases of keratoconus, where there can be a dominant upwards displacement. Pupil diameters are between 2.7 and 5.6 mm. The corneal higher order root mean square wavefront error for a 6 mm pupil ranges between 0.3 (normal eye) and 5.3 μm (keratoconus). © 2006 Elsevier GmbH. All rights reserved. Fil:Comastri, S.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Martin, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2006 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00304026_v117_n11_p537_Comastri http://hdl.handle.net/20.500.12110/paper_00304026_v117_n11_p537_Comastri
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Corneal aberrations
Ocular pupil
Data reduction
Ophthalmology
Research laboratories
Wavefronts
Corneal aberrations
Ocular pupil
Aberrations
spellingShingle Corneal aberrations
Ocular pupil
Data reduction
Ophthalmology
Research laboratories
Wavefronts
Corneal aberrations
Ocular pupil
Aberrations
Comastri, Silvia Ana Elba
Martin, Gabriel Norberto
Analysis of pupil and corneal wave aberration data supplied by the SN CT 1000 topography system
topic_facet Corneal aberrations
Ocular pupil
Data reduction
Ophthalmology
Research laboratories
Wavefronts
Corneal aberrations
Ocular pupil
Aberrations
description Ocular aberrations depend on pupil size and centring and the retinal image quality under natural conditions differs from that corresponding to laboratory ones. In the present article, pupil and wave aberration data supplied by the Shin Nippon CT 1000 (SN CT 1000) topography system are analysed. Two groups of eyes under natural viewing conditions are considered ((260±20) lux at the eye under study). The first group consists of 10 normal eyes (-1.25 to 3 D sphere; 0 to -1.75 D cylinder) of five young subjects (age between 18 and 33 years). For this group, five determinations per eye are performed and the repeatability of results is analysed. Pupil centre is displaced from corneal vertex towards the temporal region, the largest displacement being (0.5±0.1) mm. The variation of pupil diameter in each eye is less than 21% while the inter-subject variability is large since diameters are between (3±0.3) and (5.3±0.6) mm. Aberrations are evaluated for two different pupil sizes, the natural one and a fictitious one of 6 mm. The corneal higher-order root-mean square wavefront error (RMSHO) for a 6 mm pupil centred in the corneal vertex, averaged across all eyes, is (0.37±0.06) μm while, considering the natural pupil diameter, the average in each eye is significantly lower, up to eight times smaller. The fourth-order spherical aberration is an important aberration in the considered eyes, its maximum value for a 6 mm pupil being (0.38±0.02) μm. The second group consists of 24 eyes of 12 subjects (age between 25 and 68 years) such that four eyes are of normal adults (1.25 to +6 D sphere; 0 to -0.5 D cylinder), eight have astigmatisms (-5.5 to +3.25 D sphere; -1.5 to -4.5 D cylinder), six have post-refractive surgery (+0.5 to +3.5 D sphere; -0.5 to -4 D cylinder) and six have keratoconus (-9.5 to +1 D sphere; -1 to -4.5 D cylinder). For this group only one determination per eye is performed. Pupil centre is displaced from corneal vertex towards the temporal region except in cases of keratoconus, where there can be a dominant upwards displacement. Pupil diameters are between 2.7 and 5.6 mm. The corneal higher order root mean square wavefront error for a 6 mm pupil ranges between 0.3 (normal eye) and 5.3 μm (keratoconus). © 2006 Elsevier GmbH. All rights reserved.
author Comastri, Silvia Ana Elba
Martin, Gabriel Norberto
author_facet Comastri, Silvia Ana Elba
Martin, Gabriel Norberto
author_sort Comastri, Silvia Ana Elba
title Analysis of pupil and corneal wave aberration data supplied by the SN CT 1000 topography system
title_short Analysis of pupil and corneal wave aberration data supplied by the SN CT 1000 topography system
title_full Analysis of pupil and corneal wave aberration data supplied by the SN CT 1000 topography system
title_fullStr Analysis of pupil and corneal wave aberration data supplied by the SN CT 1000 topography system
title_full_unstemmed Analysis of pupil and corneal wave aberration data supplied by the SN CT 1000 topography system
title_sort analysis of pupil and corneal wave aberration data supplied by the sn ct 1000 topography system
publishDate 2006
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00304026_v117_n11_p537_Comastri
http://hdl.handle.net/20.500.12110/paper_00304026_v117_n11_p537_Comastri
work_keys_str_mv AT comastrisilviaanaelba analysisofpupilandcornealwaveaberrationdatasuppliedbythesnct1000topographysystem
AT martingabrielnorberto analysisofpupilandcornealwaveaberrationdatasuppliedbythesnct1000topographysystem
_version_ 1768543835272511488

Ejemplares similares