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

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

Status

Completed

Phases

Unknown

Study type

Observational

Source

ClinicalTrials.gov

Registry ID

NCT04263636

Enrollment

100

Registered

2020-02-11

Start date

2020-01-07

Completion date

2020-12-31

Last updated

2021-03-30

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Presbyopia

Keywords

pseudophakic presbyopic correction, trifocal intraocular lens, light intensity, eye light transmittance, light efficiency function

Brief summary

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

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)

Interventions

PROCEDUREPhacoemulsification with bilateral trifocal diffractive IOLs

Uneventful bilateral pseudophakic presbyopic correction with trifocal diffractive IOLs

Study design

Observational model

COHORT

Time perspective

PROSPECTIVE

Eligibility

Sex/Gender

ALL

Age

45 Years to 70 Years

Healthy volunteers

Yes

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.

Design outcomes

Primary

Measure	Time frame	Description
Minimum light intensity	6 months postoperatively	Minimum light intensity in which participants reach their maximum critical visual acuity

Secondary

Measure	Time frame	Description
Critical Visual Acuity (CVA)	6 months postoperatively	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.

Countries

Greece

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 14, 2026