Diagnosis, Care, and Specialist Access for Patients Across India
Best disease is named for the distinctive round, egg-yolk-like deposit it produces beneath the macula in its early stage, often picked up incidentally during a routine paediatric eye exam in India well before a child reports any change in vision. This gap between what the retina looks like on examination and how well the child actually sees is one of the more counterintuitive aspects of the condition for Indian parents to understand.
Indian paediatric ophthalmologists increasingly recognise Best disease as part of routine screening in children with a family history of vision problems, and referral to a retina specialist for confirmatory testing has become more accessible across metro and larger Tier 2 cities in recent years.
Best disease moves through recognisable stages: an early 'vitelliform' stage where the yellow lesion is visible but vision remains largely normal, a middle stage where the lesion breaks apart and blurred or distorted central vision typically becomes noticeable, and a later atrophic stage where more permanent central vision changes are established. A minority of patients develop abnormal blood vessel growth beneath the retina, which Indian retina specialists watch for particularly closely given it can cause a more sudden drop in vision.
Best disease is caused by mutations in the BEST1 gene, inherited in an autosomal dominant pattern — meaning a single mutated copy from either parent is enough to cause the condition, and it typically shows up across multiple generations of an Indian family once one member is diagnosed and the rest are screened.
In India, the characteristic retinal appearance often prompts a strong clinical suspicion at first examination, with electrooculography (EOG) used to confirm the diagnosis — this test is available at most major tertiary eye centres in Indian metros. OCT imaging tracks the lesion's stage over time, and genetic testing for BEST1, now offered by several Indian diagnostic labs, can confirm the diagnosis and help identify at-risk relatives before symptoms develop.
There's no treatment that reverses the underlying gene defect, so Indian retina specialists typically monitor the lesion's stage at intervals, treating the uncommon complication of abnormal blood vessel growth with anti-VEGF injections when it occurs — a treatment now widely available across India's major eye hospitals. Because the disease often remains stable for long stretches, many patients are simply monitored without active intervention for years.
It can sometimes be flagged if a screening includes a dilated fundus exam, though most routine school vision screenings focus on visual acuity and may miss the retinal lesion; a comprehensive eye exam is more likely to detect it.
It's available at most major tertiary eye hospitals and larger retina centres in metro cities, though access may be more limited in smaller towns, where referral to a bigger centre is often needed.
Since it's autosomal dominant, each child has roughly a 50% chance of inheriting the mutated gene, though how visibly it affects their vision can still vary between individuals.
Yes, anti-VEGF injection therapy is now widely available at retina centres across India's major cities and is a well-established treatment for the abnormal blood vessel growth that can occur in Best disease.