Mom, started having vision problems when she was 16 years old. Her parents took her to the "eye doctor" and they checked her and fitted her with glasses.
Had she seen an Opthamologist...they may have noticed the little Angiomas growing on her retina. They may have been able to save her sight.
Instead, in 1962 or 1963 she woke up blind in one eye. They went to the doctor and then to specialists and was diagnosed with VHL. Her retina had detached. Later they tried to save her other eye but...no use. It was too far gone.
My mom lost her sight.