Luminous Efficiency Function V(λ)' of Patients That Underwent Pseudophakic Presbyopic Corrections

Study Overview
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Brief Summary
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Primary objective of this study is to construct and validate a modified luminous efficiency function that addresses the distinct total eye light transmittance of patients that underwent bilateral pseudophakic presbyopic correction with trifocal intraocular lenses (IOLs) implantations.

Detailed Description
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Present study aims to identify in which degree multifocal IOLs modify eye light transmission and estimate the necessary task and environmental lighting adjustment in order to address lighting needs of patients following bilateral pseudophakic presbyopic corrections. Specifically, the aim of this study is to identify the minimum light intensity in which patients that underwent pseudophakic presbyopic correction with trifocal IOLs can reach their maximum visual acuity (measured when lights are at the 100% lighting level)

Official Title
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Introduction of a Modified Luminous Efficiency Function V(λ)' That Addresses Total Light Transmittance of Patients That Underwent Pseudophakic Presbyopic Corrections

Conditions
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Presbyopia

Intervention / Treatment
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* Procedure: Phacoemulsification with bilateral trifocal diffractive IOLs


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: age between 45 to 70 years Exclusion Criteria: astigmatism >1.00 diopters glaucoma former incisional eye surgery corneal or fundus disease diabetes mellitus autoimmune diseases neurological or psychiatric diseases posterior capsule rupture or lens misalignment postoperative uncorrected bilateral distant visual acuity < 8/10.

Ages Eligible for Study
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Minimum Age: 45 Years
Maximum Age: 70 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 |
| --- | --- |
| Study group<br>Patients that underwent uneventful bilateral pseudophakic presbyopic correction with trifocal diffractive IOLs (PanOptix or PanOptix toric, Alcon Laboratories, Inc., Fort Worth, TX, USA) | Procedure: Phacoemulsification with bilateral trifocal diffractive IOLs<br>* Uneventful bilateral pseudophakic presbyopic correction with trifocal diffractive IOLs<br>|
| Control group<br>Patients of similar age without cataract that their crystalline lens has not been replaced. | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Minimum light intensity | Minimum light intensity in which participants reach their maximum critical visual acuity | 6 months postoperatively | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Critical Visual Acuity (CVA) | The print size of the optotype line fulfilling this criterion: all of the following lines are read at a time that is 1.96 times the standard deviation over the average reading time of the larger preceding lines. In clinical practice, the CVA is the minimum VA that can be read with the maximum possible speed. | 6 months postoperatively | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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pseudophakic presbyopic correction, trifocal intraocular lens, light intensity, eye light transmittance, light efficiency function