The eye defect $Astigmatism$ can be corrected by using:

The point in the eye of mammals from which optic nerves and blood vessels leave the eyeball is known as:

Select the correct option based on the given sentences regarding the mechanism of vision:
$(I)$ Light rays in the visible wavelength are focused on the retina through the cornea and lens.
$(II)$ It generates impulses in rods and cones.
$(III)$ Photosensitive pigment is composed of an opsin (protein) and retinal (an aldehyde of vitamin $A$).
$(IV)$ Light induces the dissociation of retinal and opsin.
$(V)$ This process causes a change in membrane permeability,as a result,potential differences are generated in the photoreceptor cells.

The yellow spot on the retina is known for:

The pecten,a comb-like structure,is found in the eye of which of the following?

The visual pigment in the rods of the retina of the vertebrate eye,which is responsible for the detection of light,is: