Color Blindness, Color Vision Defects
Conditions
Keywords
Anomalous Trichromats, Color Vision Defect, Contact Lenses
Brief summary
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.
Detailed description
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.
Interventions
DEVICEred tint contact lenses
to compare the performance of these lenses.
Sponsors
National University of Malaysia
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
DEVICE_FEASIBILITY
Masking
SINGLE (Outcomes Assessor)
Masking description
Only the principal investigator knows the identity of each of the lenses.
Intervention model description
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.
Eligibility
Sex/Gender
ALL
Age
18 Years to 40 Years
Healthy volunteers
Yes
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
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| The lens which gives the best result in TES value | 30 minutes after lens adaptation. Lens is removed immediately after the assessment is completed. | 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 lens which gives the best performance in ES value | 30 minutes after lens adaptation. Lens is removed immediately after the assessment is completed | 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 |
Countries
Malaysia
Outcome results
None listed