Archives for: Learn
Why do we cry?
Emotional tearsΒ are caused by strong feelings of happiness, sadness or pain β are different from the tears...
What happens at the opticians?
When you visit the optician, theyβll start by asking some general questions as to your health, whether you...
What are cataracts?
Surgeons today can replace them with a plastic lens, but did you know that surgeons have been trying to...
Why do people wear glasses?
The eyeβs squishy, stretchy lens is surrounded by muscles called ciliary muscles which contract...
Why do we blink?
Blinking is both a voluntary and involuntary action, meaning you can blink whenever you want to, but you also...
What is the vitreous?
The insides of the eyeball are really cool, but you can't see them with just your own eyes! Opticians and...
What is the sclera?
The conjunctiva is a mucous membrane that covers the exposed front portion of the sclera and lines the inside...
What is the retina?
Imagine that the eye is like a non-digital camera, and the retina is the film. Rays of light enter the eye...
What is the iris?
It changes the size of the pupil and allows different amounts of light to enter the eye. When people ask...
What is the pupil?
The size of the pupil is controlled by muscles. When more light is needed, the pupil is made larger and...