Grey Filter Contact Lens as Therapeutic Option for Acquired Reduced Binocular Visual Performance.

Area of Science:

• Ophthalmology
• Optometry
• Visual Neuroscience

Background:

• Unilateral acquired reduced visual performance or intractable diplopia can lead to diminished binocular performance and complaints.
• A grey filter contact lens hypothesis suggests improving binocular visual comfort by altering central visual image processing.
• The grey filter minimally impacts peripheral vision while delaying the image from the affected eye.

Purpose of the Study:

• To evaluate the efficacy of a grey filter contact lens in reducing patients' daily binocular complaints.
• To assess the safety and clinical utility of this intervention for specific visual impairments.

Main Methods:

• Nineteen consecutive patients with unilateral acquired reduced visual performance or intractable diplopia were fitted with a grey filter contact lens.
• Contact lenses were selected from six available filters based on patient preference and fitted using standard practices.
• Patient-reported outcomes were assessed to determine the effectiveness of the intervention.

Main Results:

• Data from 18 patients showed that 67% reported good results with the grey filter contact lens.
• A significant 28% of patients discontinued lens wear as their binocular complaints resolved during and after use.
• The intervention demonstrated a positive impact on binocular visual comfort in daily life.

Conclusions:

• The grey filter contact lens is a clinically useful, safe, and reversible treatment option.
• It effectively addresses binocular visual complaints arising from acquired monocular visual quality reduction.
• This intervention offers a practical solution for improving binocular vision in affected individuals.