One day when my father was driving at the age of 55, he noticed the streetlights were wavering. For most of us, that would have been enough to make an appointment, but it took my father several years before he finally consulted an eye specialist. The diagnosis: macula of the retina. Since then, his eyesight has deteriorated so much that his ophthalmologist recommended a treatment: injecting an anti-VEGF (vascular endothelial growth factor) chemical directly into the eye.