Performance of Red Tinted Contact Lenses on Colour Defects (CL)

The Performance of Red Tinted Contact Lenses of Various Tones on Colour Deficient Subjects: A Pilot Study

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.

6 colour defect subjects eye were inserted with 4 different types of red tinted contact lenses at different times and then tested with Ishihara Test and 100 Hue Test to obtain the score values. This was done only on one non dominant eye of subject.

6 subjects will be inserted with the Type A red Tint Lenses. Only the non dominant eye will be inserted. The comparison is made before and after wearing the CL.

6 subjects will be inserted with the Type B red Tint Lenses. Only the non dominant eye will be inserted. The comparison is made before and after wearing the CL.

6 subjects will be inserted with the Type C red Tint Lenses. Only the non dominant eye will be inserted. The comparison is made before and after wearing the CL.

6 subjects will be inserted with the Type D red Tint Lenses. Only the non dominant eye will be inserted. The comparison is made before and after wearing the CL.

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

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

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

only the executive summary of all data analysis published by journals will be made available. IPD will be shared only when requested.

Cole BL, Lian KY, Lakkis C. Using clinical tests of colour vision to predict the ability of colour vision deficient patients to name surface colours. Ophthalmic Physiol Opt. 2007 Jul;27(4):381-8. doi: 10.1111/j.1475-1313.2007.00493.x.