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An autosomal dominant hereditary vitreoretinal degeneration caused by VCAN gene mutation. It is a rare disease characterized by optically empty vitreous, presenting with myopia, juvenile cataract, night blindness, and progressive chorioretinal atrophy.

Explains the causes and treatments for eyelid twitching (orbicularis myokymia), and the differential diagnosis and treatment (botulinum toxin, MVD) for essential blepharospasm and hemifacial spasm.

Explains the causes of floaters (symptoms of seeing floating objects in front of the eyes), the difference between physiological floaters and pathological floaters, danger signs that require medical attention, and eye examinations and treatments.

The Worth 4-Light Test (W4LT) is a clinical examination that uses red-green glasses to evaluate binocular vision (fusion, suppression, anomalous retinal correspondence, diplopia). It can be performed from around 3 years of age and is tested at both near and far distances.