Image registration reveals central lens thickness minimally increases during accommodation

Ronald A Schachar,1 Majid Mani,2 Ira H Schachar31Department of Physics, University of Texas at Arlington, Arlington, TX, 2California Retina Associates, El Centro, 3Byers Eye Institute of Stanford University, Palo Alto, CA, USAPurpose: To evaluate anterior chamber depth, central crystalline lens thic...

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Autores principales:	Schachar RA, Mani M, Schachar IH
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2017
Materias:	swept-source biometry accommodation anterior chamber depth crystalline lens thickness image registration lens curvature Ophthalmology RE1-994
Acceso en línea:	https://doaj.org/article/7eef2981cf8744218fc0855d4128fbc3
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spelling	oai:doaj.org-article:7eef2981cf8744218fc0855d4128fbc32021-12-02T02:47:33ZImage registration reveals central lens thickness minimally increases during accommodation1177-5483https://doaj.org/article/7eef2981cf8744218fc0855d4128fbc32017-09-01T00:00:00Zhttps://www.dovepress.com/image-registration-reveals-central-lens-thickness-minimally-increases--peer-reviewed-article-OPTHhttps://doaj.org/toc/1177-5483Ronald A Schachar,1 Majid Mani,2 Ira H Schachar31Department of Physics, University of Texas at Arlington, Arlington, TX, 2California Retina Associates, El Centro, 3Byers Eye Institute of Stanford University, Palo Alto, CA, USAPurpose: To evaluate anterior chamber depth, central crystalline lens thickness and lens curvature during accommodation.Setting: California Retina Associates, El Centro, CA, USA.Design: Healthy volunteer, prospective, clinical research swept-source optical coherence biometric image registration study of accommodation.Methods: Ten subjects (4 females and 6 males) with an average age of 22.5 years (range: 20–26 years) participated in the study. A 45° beam splitter attached to a Zeiss IOLMaster 700 (Carl Zeiss Meditec Inc., Jena, Germany) biometer enabled simultaneous imaging of the cornea, anterior chamber, entire central crystalline lens and fovea in the dilated right eyes of subjects before, and during focus on a target 11 cm from the cornea. Images with superimposable foveal images, obtained before and during accommodation, that met all of the predetermined alignment criteria were selected for comparison. This registration requirement assured that changes in anterior chamber depth and central lens thickness could be accurately and reliably measured. The lens radii of curvatures were measured with a pixel stick circle.Results: Images from only 3 of 10 subjects met the predetermined criteria for registration. Mean anterior chamber depth decreased, −67 µm (range: −0.40 to −110 µm), and mean central lens thickness increased, 117 µm (range: 100–130 µm). The lens surfaces steepened, anterior greater than posterior, while the lens, itself, did not move or shift its position as appeared from the lack of movement of the lens nucleus, during 7.8 diopters of accommodation, (range: 6.6–9.7 diopters).Conclusion: Image registration, with stable invariant references for image correspondence, reveals that during accommodation a large increase in lens surface curvatures is associated with only a small increase in central lens thickness and no change in lens position.Keywords: swept-source biometry, accommodation, anterior chamber depth, crystalline lens thickness, image registration, lens curvatureSchachar RAMani MSchachar IHDove Medical Pressarticleswept-source biometryaccommodationanterior chamber depthcrystalline lens thicknessimage registrationlens curvatureOphthalmologyRE1-994ENClinical Ophthalmology, Vol Volume 11, Pp 1625-1636 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	swept-source biometry accommodation anterior chamber depth crystalline lens thickness image registration lens curvature Ophthalmology RE1-994
spellingShingle	swept-source biometry accommodation anterior chamber depth crystalline lens thickness image registration lens curvature Ophthalmology RE1-994 Schachar RA Mani M Schachar IH Image registration reveals central lens thickness minimally increases during accommodation
description	Ronald A Schachar,1 Majid Mani,2 Ira H Schachar31Department of Physics, University of Texas at Arlington, Arlington, TX, 2California Retina Associates, El Centro, 3Byers Eye Institute of Stanford University, Palo Alto, CA, USAPurpose: To evaluate anterior chamber depth, central crystalline lens thickness and lens curvature during accommodation.Setting: California Retina Associates, El Centro, CA, USA.Design: Healthy volunteer, prospective, clinical research swept-source optical coherence biometric image registration study of accommodation.Methods: Ten subjects (4 females and 6 males) with an average age of 22.5 years (range: 20–26 years) participated in the study. A 45° beam splitter attached to a Zeiss IOLMaster 700 (Carl Zeiss Meditec Inc., Jena, Germany) biometer enabled simultaneous imaging of the cornea, anterior chamber, entire central crystalline lens and fovea in the dilated right eyes of subjects before, and during focus on a target 11 cm from the cornea. Images with superimposable foveal images, obtained before and during accommodation, that met all of the predetermined alignment criteria were selected for comparison. This registration requirement assured that changes in anterior chamber depth and central lens thickness could be accurately and reliably measured. The lens radii of curvatures were measured with a pixel stick circle.Results: Images from only 3 of 10 subjects met the predetermined criteria for registration. Mean anterior chamber depth decreased, −67 µm (range: −0.40 to −110 µm), and mean central lens thickness increased, 117 µm (range: 100–130 µm). The lens surfaces steepened, anterior greater than posterior, while the lens, itself, did not move or shift its position as appeared from the lack of movement of the lens nucleus, during 7.8 diopters of accommodation, (range: 6.6–9.7 diopters).Conclusion: Image registration, with stable invariant references for image correspondence, reveals that during accommodation a large increase in lens surface curvatures is associated with only a small increase in central lens thickness and no change in lens position.Keywords: swept-source biometry, accommodation, anterior chamber depth, crystalline lens thickness, image registration, lens curvature
format	article
author	Schachar RA Mani M Schachar IH
author_facet	Schachar RA Mani M Schachar IH
author_sort	Schachar RA
title	Image registration reveals central lens thickness minimally increases during accommodation
title_short	Image registration reveals central lens thickness minimally increases during accommodation
title_full	Image registration reveals central lens thickness minimally increases during accommodation
title_fullStr	Image registration reveals central lens thickness minimally increases during accommodation
title_full_unstemmed	Image registration reveals central lens thickness minimally increases during accommodation
title_sort	image registration reveals central lens thickness minimally increases during accommodation
publisher	Dove Medical Press
publishDate	2017
url	https://doaj.org/article/7eef2981cf8744218fc0855d4128fbc3
work_keys_str_mv	AT schacharra imageregistrationrevealscentrallensthicknessminimallyincreasesduringaccommodation AT manim imageregistrationrevealscentrallensthicknessminimallyincreasesduringaccommodation AT schacharih imageregistrationrevealscentrallensthicknessminimallyincreasesduringaccommodation
_version_	1718402173379805184

Image registration reveals central lens thickness minimally increases during accommodation

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