Conjunctiva is a

The space between the cornea and the lens is called .....

The muscles surrounding the pupil of a rabbit's eye are:

In the chemistry of vision in mammals,the photosensitive substance is called

In the mammalian eye, the power of accommodation is controlled by changing the shape of the lens. It is governed by:

Daylight (photopic) vision and colour vision are functions of $P$,while twilight (scotopic) vision is a function of $Q$.
$\quad\quad \quad P\quad\quad\quad Q$