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

National University of Malaysia

Status: Completed

Conditions: Color Vision Defects; Color Blindness

Treatments: Device: red tint contact lenses

Study type: Interventional

Funder types: Other

Identifiers

NCT05643222

UKM PPI/111/8/JEP-2021-145

Details and patient eligibility

About

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.

Full 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.

Enrollment: 6 patients

Sex: All

Ages: 18 to 40 years old

Volunteers: Accepts Healthy Volunteers

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

Trial design

Primary purpose: Device Feasibility

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Single Blind

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6 participants in 4 patient groups

TES and performance assessment with Type A Red Tint Lens

Active Comparator group

Description:

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.

Treatment:

Device: red tint contact lenses

TES and performance assessment with Type B Red Tint Lens

Active Comparator group

Description:

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.

Treatment:

Device: red tint contact lenses

TES and performance assessment with Type C Red Tint Lens

Active Comparator group

Description:

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.

Treatment:

Device: red tint contact lenses

TES and performance assessment with Type D Red Tint Lens

Active Comparator group

Description:

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.

Treatment:

Device: red tint contact lenses