Performance of Red Tinted Contact Lenses on Colour Defects

National University of Malaysia6 enrolled

Overview

This study aimed to relate and compare the performance of 4 types of red-tinted contact lenses (CL) with the Total Error Score (TES) from the Farnsworth-Munsell 100 Hue test on colour deficient subjects. Only 6 subject with colour vision defect was tested in this study.

Six congenital CVD subjects were recruited. After colour vision screening using Ishihara plate, the Farnsworth-Munsell 100 Hue test was carried out to determine the type and severity of colour vision deficiency. Four types of red-tinted CL (Type A, B, C and D) were used. The performance of each of these lenses was determined through the comparison of error scores in the Ishihara test before and after wearing tinted contact lens on only the non-dominant eye. Then, the transmittance of each tinted CL was determined using a spectrophotometer. All these lenses were fitted on the subjects in one day where the subjects were given a 30-minute break for each intervention.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

DEVICE_FEASIBILITY

Masking

SINGLE

Enrollment

Conditions

Color Vision Defects Color Blindness

Interventions

red tint contact lensesDEVICE

to compare the performance of these lenses.

Eligibility

Sex: ALLMin age: 18 YearsMax age: 40 YearsHealthy volunteers:

Medical Language ↔ Plain English

Inclusion Criteria: * Age range 18-40 years * all sex * color defect diagnosed with Ishihara Test * no contraindication in contact lens wear Exclusion Criteria: * have ocular and systemic diseases

Locations (1)

Optometry Clinic

Kuala Lumpur, Malaysia

Outcomes

Primary Outcomes

The lens which gives the best result in TES value

The highest TES value scored showed higher performance in colour vision. TES is an automated, generated value that calculates the number of tiles placed incorrectly and scales the value for uniform analysis. Average TES scores range from thirty to forty in series tests; while scores exceeding seventy can point to a marker for color blindness. Lower scores are intended to point to significantly increased color vision accuracy, as the TES score is directly correlated to the number of tiles incorrectly identified

Time frame: 30 minutes after lens adaptation. Lens is removed immediately after the assessment is completed.

The lens which gives the best performance in ES value

The highest score achieved using Ishihara Test indicates the best red tint lens. The current passing score is 12 correct of 14 red/green test plates (not including the demonstration plate). Research has shown that scores below twelve indicate color vision deficiency, and twelve or more correct indicate normal color vision, with 97% sensitivity and 100% specificity

Time frame: 30 minutes after lens adaptation. Lens is removed immediately after the assessment is completed

Data from ClinicalTrials.gov

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