Question

Aperture of an eye can be changed by
A. Aqueous humor
B. Vitreous humor
C. Ciliary muscles
D. Iris

Answer 1

Hint: The eye is an organ of vision in the body. It reacts to light and allows vision. Eyes recognize light and convert that light into electrochemical impulses in neurons. Aperture is the opening of the diaphragm of a lens through which light passes. Lower f/stops represent the larger aperture and the higher f/stops represent smaller apertures. The maximum aperture of an eye is f/2.4. The pupil of an eye acts as an aperture.

Complete answer:
-Aperture is a hole via which light enters the eye.
-It is called a pupil.
-The size of the aperture is controlled by iris.
-It is a circular and thin structure in the eye.
-It can change the size and diameter of the pupil.
-Thus, the iris regulates the amount of light that enters the pupil and reaches the retina.
-Aqueous humor transports oxygen and nutrients to cells of the cornea, iris and lens.
-The vitreous humor plays a significant role in the protection of an eye. Vitreous humor helps the eye to hold its spherical shape.
-The converging power of the eye lens is controlled by ciliary muscles.
So, the correct answer is “Option D”.

Additional Information:
Parts of an eye include:
Sclera: white eye part.
Pupil: It is a black dot located at the center of the eye.
Iris: It surrounds the pupil.
Cornea: Refractive surface of the eye.
Lens: It is a transparent body that is enclosed in an elastic capsule.
Vitreous humor: It fills the space between retina and lens and maintains the shape of an eye.
Optic nerve: It transfers information of vision from the retina to the brain.
Retina: It receives the light and converts it into neural signals and transmits these signals to the brain for the recognition of vision.

Note: Aperture is the opening of the diaphragm of a lens through which light passes. Lower f/stops represent the larger aperture and the higher f/stops represent smaller apertures. The maximum aperture of an eye is f/2.4. The pupil of an eye acts as an aperture. The size of the aperture is controlled by iris. It is a circular and thin structure in the eye. It can change the size and diameter of the pupil. Thus, the iris regulates the amount of light that enters the pupil and reaches the retina.