The cavity of the vitreous humour in the eyes is situated:

The sensory pigmented layer of the eye is known as:

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.

The friction between the eyelids and the cornea is avoided by the secretion of

To correct the defect of myopia (nearsightedness),a person should use a ....

Explain the mechanism of vision in detail.