Modern cataract surgery is a safe, effective procedure, but it wasn't always this way. The earliest record dates back to the fifth century BC.

I will often take a retinoscope, and I will shine the light beam into your retina and by seeing the reflection of that eye come back at me, I can dial in lenses ... be seen inside the eye, you ...

When you wear contact lenses, they should float on the surface of your eye. They can slide slightly with every blink but generally stay in sync with your eyeball. Clear vision and comfortable ...

But the other two are surprisingly sophisticated; like Nilsson’s eyes, they have light-focusing lenses and can see images, albeit at lower resolution. Nilsson uses his eyes to, among other ...

The lens is a structure tucked deep inside the eye that helps us focus our vision on objects near and far. Natural lenses ...

Sinead has got to check that the actor's eyes are suitable for lenses. She does a prescription check, then checks the inside the retina with an ophthalmoscope and takes a 3D scan. Further checks ...