NDD#20 Visual Disorders

What is the primary function of the cornea in the eye?

• It regulates the size of the pupil.

• It is the main protective layer of the eye.

• It begins the process of refraction by bending light as it enters the eye.

• It contains pigments that are sensitive to light.

What is the role of the iris in the eye?

• It helps in the process of accommodation.

• It regulates the size of the pupil in response to ambient light.

• It converts light energy into electrical signals.

• It is responsible for the eye's ability to focus on distant objects.

Which of the following is NOT a function of the lens in the eye?

• Accommodating for near and far vision.

• Producing aqueous humor.

• Changing shape to allow the eye to focus on objects at different distances.

• Refracting light to focus it on the retina.

What are the two main types of photoreceptor cells in the retina?

• Iris and cornea

• Aqueous humor and vitreous humor

• Sclera and choroid

• Rods and cones

What is the primary cause of myopia (short-sightedness)?

• The eyeball being too long, causing light to focus in front of the retina.

• Clumping of proteins in the lens.

• The lens losing its flexibility with age.

• Degeneration of the macula.

What is the main difference between rods and cones in the eye?

• Rods regulate the size of the pupil, while cones do not.

• Cones are found in the sclera, while rods are not.

• Cones are responsible for color vision, while rods are more sensitive in low light.

• Rods are responsible for color vision, while cones are not.

What is the function of the optic nerve?

• It produces the vitreous humor.

• It carries visual information from the retina to the brain.

• It regulates the amount of light entering the eye.

• It changes the shape of the lens.

What condition is characterized by a cloudiness forming on the lens, leading to blurred vision?

• Macular degeneration

• Hyperopia

• Myopia

• Cataracts

What is the primary function of the aqueous humor in the eye?

• It absorbs light to prevent internal reflection.

• It maintains intraocular pressure and refracts light.

• It provides nutrients to the eye tissues.

• It contains pigments sensitive to light.

What is the significance of the fovea in the eye?

• It is where the optic nerve exits the eye, creating a blind spot.

• It is responsible for the eye's highest visual acuity and is densely packed with cones.

• It is the primary area for night vision.

• It regulates the flow of aqueous humor to maintain eye pressure.