How many oblique and rectus muscles are present for the movement of the eyeball in various directions within the eye orbit?

Which of the following statements are correct regarding the fovea?
$I -$ The central pit of the macula lutea is called the fovea.
$II -$ The fovea is a thinned-out portion of the retina.
$III -$ The fovea contains densely packed rods.
$IV -$ Visual acuity is highest in the fovea region.

Which of these cells are not found in the retina?

Which of the following statements is correct?

The cornea and lens of the mammalian eyes are both

The pupil becomes bigger to allow more light during dark by the: