Vision Questions

Which eye layer forms the white outer coat and provides attachment sites for the extraocular muscles?

• Retina

• Sclera

• Choroid

• Lens

The transparent portion of the fibrous tunic that provides most of the eye’s focusing power is the:

• Cornea

• Iris

• Ciliary body

• Pupil

The vascular layer of the eye that contains blood vessels and pigment to absorb stray light is the:

• Retina

• Cornea

• Choroid

• Sclera

Which structure suspends the lens and can alter its curvature for focusing?

• Zonular fibers of the suspensory ligament

• Optic nerve

• Macula lutea

• Fovea centralis

What fills the anterior chamber of the eye?

• Vitreous humor

• Cerebrospinal fluid

• Aqueous humor

• Lacrimal fluid

The vitreous humor primarily functions to:

• Maintain intraocular pressure and structural support

• Nourish the lens

• Absorb ultraviolet light

• Control light entry

The fovea centralis provides the sharpest vision because it contains:

• Only rods

• A high density of cones

• Both rods and cones equally

• Only bipolar cells

Why is the image inverted on the retina?

• Refraction of light at the air–cornea interface

• Action of the ciliary muscles

• Retinal pigment epithelium reflection

• Curvature of the optic disc

The strength of a lens is expressed in:

• Lumens

• Diopters

• Nanometers

• Candela

A lens that brings parallel rays of light to a focus 0.5 m from its center has a strength of:

• 0.5 diopters

• 2 diopters

• 5 diopters

• 10 diopters