Age-Related Changes and Cycloplegia-Induced Differences in the Human Crystalline Lens

Study Overview
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Brief Summary
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The ocular biometric parameters of the human crystalline lens including anterior chamber depth (ACD), lens thickness (LT), radii of curvature of anterior and posterior lens (ALR and PLR), lens equatorial diameter (LED), and lens vault (LV), automatically quantified by the CASIA2 (SS-OCT; Tomey, Nagoya, Japan). Images of iridocorneal angle were obtained using CASIA2 and the Schlemm' s canal (SC) and trabecular meshwork (TM) were quantified manually. Both cycloplegia and non-cycloplegia images were obtained.

Detailed Description
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Healthy individuals aged between 6 and 90 years, without history of ocular disease (except age-related cataract and/or myopia), were consecutively included from April to May 2019. All participants underwent visual acuity, dry and wet refraction, anterior and posterior segment examination, intraocular pressure (IOP), and axial length (AL) using IOL-Master 700 (Carl Zeiss Meditec AG). Investigators recruited children under 18 years old at a refraction outpatient clinic, who were prescribed cyclopentolate hydrochloride eyedrops (S.A. Alcon-Couvreur N.V., Belguim) for cycloplegic refraction. For adults, they were prescribed compound tropicamide eyedrops (Mydrin-P, Santen Pharmaceutical Co., Ltd, Osaka, Japan), consisting of 0.5% tropicamide mixed with 0.5% phenylephrine hydrochloride, for pupillary dilation in order to perform fundus examination at an outpatient clinic. Exclusion criteria were as follow:ocular diseases other than cataracts; history of eye surgeries or injuries; shallow anterior chamber with a risk of angle closure. The data from right eye was selected for analysis.

Official Title
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Age-Related Changes and Cycloplegia-Induced Differences of the Human Crystalline Lens, Schlemm' s Canal and Trabecular Meshwork：an in Vivo Swept-Source Optical Coherence Tomography Study

Conditions
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Cataract

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Healthy individuals aged between 6 and 90 years, without history of ocular disease (except age-related cataract and/or myopia) Must be able to cooperate examination Exclusion Criteria: ocular diseases other than cataracts history of eye surgeries or injuries shallow anterior chamber with a risk of angle closure

Ages Eligible for Study
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Minimum Age: 6 Years
Maximum Age: 86 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Group 1<br>participants of less than 18 years old | |
| Group 2<br>participants aged from 18 years to 40 year | |
| Group 3<br>participants aged from 41 years to 60 years | |
| Group 4<br>participants over 60 years old | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Paired Comparison Before and After Cycloplegia | The cycloplegia-induced differences of parameters was defined as: the post-cycloplegic value minus the pre-cycloplegic value. | 2020.2.3 | 
| Evaluated the effect of age on the TM/SC morphologies | The age-related variations of TM/SC parameters from four age groups were compared. | 2020.2.3 | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Evaluated the effect of age on the ocular biometric data | The age-related variations of ocular biometric data such as axial length (AL), lens thickness (LT), and anterior chamber depth (ACD) from four age groups were compared. | 2020.2.3 | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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radius of curvature, lens thickness, equatorial diameter, lens vault, cycloplegia, swept-source optical coherence tomography, schlemm' s canal, trabecular meshwork