Plain answers, written by the doctor

A drop only works if it actually reaches the eye. The technique for adults and for children, and how long to wait between two medicines.

The difference between SICS and phaco, and which lens — from monofocal to multifocal — suits whom.

With age the clear lens inside the eye turns cloudy — like dust settling on glass. But age is not the only cause.

In glaucoma the optic nerve is damaged slowly, and early on there are no symptoms at all. Who is at risk, how it is diagnosed, and what treatment involves.

When there are too few tears, or the tears are of poor quality, the eye dries out. Long hours on a screen make it worse — here is what actually helps.

Diabetes can affect the eye in three distinct ways — and early on none of them hurt. Which is why the check is not something you wait for symptoms to prompt.