FREE CPO Basic Science Questions and Answers
Which photoreceptor is primarily responsible for night vision?
Rods are highly sensitive to low light levels and are essential for night vision. Cones, on the other hand, are responsible for color vision and function best in bright light.
Which part of the eye is responsible for focusing light onto the retina?
The cornea is the primary structure responsible for bending (refracting) light to help focus it onto the retina. While the lens also contributes to focusing, the cornea provides the majority of the eye's refractive power.
What is the aqueous humor, and where is it located?
The aqueous humor is a clear fluid that fills the anterior and posterior chambers between the cornea and the lens. It helps maintain intraocular pressure and nourishes the cornea and lens.
What is the primary function of the retina?
The retina contains photoreceptor cells (rods and cones) that detect light and convert it into electrical impulses, which are then transmitted to the brain via the optic nerve.
Which structure controls the size of the pupil?
The iris is the colored part of the eye and contains muscles that adjust the size of the pupil to control the amount of light entering the eye.