The yellow spot on the retina is known for:

Which structure of the eye is involved in focusing the eye?

The second cranial nerve in humans originates from:

Cones are concerned with the reception of

Label the following parts in the given diagram of the human eye:
$(a)$ Aqueous chamber
$(b)$ Cornea
$(c)$ Lens
$(d)$ Retina
$(e)$ Vitreous chamber
$(f)$ Blind spot.

The cornea and lens of mammalian eyes are both