The entire machinery works in quite an intricate manner. Eyelids are the outermost protective parts of the eye. They act as ‘shutters’ and primary barriers against external environment.

Your eye is a slightly asymmetrical globe, about an inch in diameter. The front part (what you see in the mirror) includes: Just behind the iris and pupil lies the lens, which helps focus light on ...

A human eye has more than a million light ... Alternatively, students could explore the different parts of the eye. Given a diagram of the eye, students could be asked to add labels and annotation ...