What is keratoconus? Definition, causes and progression
What is keratoconus? Definition, causes and progression Keratoconus is a progressive deformation of the cornea, which gradually thins…
“Carrots improve your eyesight”: the story of a phrase born in 1940
It is probably the most repeated sentence in the history of ophthalmology, and one of the most misunderstood. Born in the winter of 1940, it hides one real biochemical fact under a mountain of exaggeration. What vitamin A actually does for night vision, what the large trials found, and the causes worth looking for when you see less well after dark.
What determines eye colour?
Key points Eye colour depends on a single pigment, melanin, contained in the iris: there is neither a…
Diplopia: when and why you see double
Key points Diplopia is the medical term for double vision: one and the same object is perceived as…
Having astigmatism: definition, symptoms and correction
Key points Having astigmatism means having an eye whose cornea, and sometimes the lens, is not perfectly spherical:…
“Restoring sight to the blind”: what Neuralink’s Blindsight implant can actually do
“Restoring sight to the blind”: what Neuralink’s Blindsight implant can actually do Elon Musk announced in March 2025…
Mydriasis and miosis: why a pupil dilates or constricts
Mydriasis and miosis: why a pupil dilates or constricts Mydriasis refers to an abnormally dilated pupil, miosis to…
Eye anatomy: understanding how your vision works
Key points The eye works like a sophisticated camera: an optical system at the front focuses the light,…
Getting a second opinion before eye surgery: when, why and how
Getting a second opinion before eye surgery: when, why and how You have been offered eye surgery and…
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