Physiology Quiz

What is the function of rods in the retina?

• Peripheral vision

• Day vision

• Night vision

• Color vision

What causes Myopia (Near sightedness)?

• Short eyeball

• Low refractive power of lens

• Weak lens system

• Long eyeball

What is the mechanism of accommodation in the eye?

• Constriction of pupil

• Convergence of eye ball

• Contraction of ciliary muscle

• Relaxation of ciliary muscle

What is the function of cones in the retina?

• Night vision

• Peripheral vision

• Color vision

• Day vision

What is the purpose of the Fovea in the retina?

• Greatest visual acuity

• Color vision

• Night vision

• Peripheral vision

What is the main cause of Hyperopia (Farsightedness)?

• Weak lens system

• High refractive power of lens

• Short eyeball

• Long eyeball

What is the effect of bright light on cones in the retina?

• Decreased sensitivity

• Increased sensitivity

• Converted back to rhodopsin

• Reduced to retinals and opsins

What is the main cause of Astigmatism?

• Irregularity in the surface of the cornea

• Low refractive power of lens

• Weak lens system

• Short eyeball

What is the function of the lens in the eye?

• Image formation on retina

• Color vision

• Night vision

• Peripheral vision

What is the purpose of dark adaptation in the eye?

• Convert Vitamin A to retinal

• Convert retinals to Vitamin A

• Decrease sensitivity to light

• Increase sensitivity to light