Eye Structure and Function Quiz

What is the transparent protective layer of the eye called?

What is the tough outer coat of the eye called?

What part of the eye refracts light?

What structure controls the size of the pupil?

What lets light enter the eye?

Which muscle relaxes and contracts during accommodation?

What holds the lens in place?

What structure becomes flatter (less convex) and rounded (more convex) during accommodation?

What layer is located under the sclera and contains pigment cells and blood vessels?

What light-sensitive layer contains rod and cone cells?

Where are cone cells concentrated?

What carries impulses to the brain?

Where is the blind spot located?

What is the process called when the eye's lens changes shape to focus near or far objects on the retina?

When focusing on a nearby object, what happens to the ciliary muscles and suspensory ligaments?

When focusing on a distant object, what happens to the ciliary muscles and suspensory ligaments?

What is the natural adjustment in the eye's pupil size in response to varying light levels called?

What happens in bright light?

Eye Structure and Function

Conjunctiva: Transparent protective layer
Sclera: Tough outer coat
Cornea: Refracts light
Iris: Coloured ring of tissue, controls pupil size
Pupil: Hole in iris, lets light in
Ciliary muscle: Ring of muscle, relaxes and contracts during accommodation
Suspensory ligaments: Fibres that hold the lens in place, stretch and become slack during accommodation
Lens: Changes shape to focus near or far objects on retina
Choroid: Dark layer under sclera, contains pigment cells and blood vessels; prevents light reflection
Retina: Light-sensitive layer with rod and cone cells
Fovea: Centre of retina, high concentration of cone cells, sharpest image formation
Optic nerve: Carries impulses to brain
Blind spot: Where optic nerve leaves eye, no light receptors
Accommodation: Eye's lens changing shape to focus near or far objects

Accommodation Mechanism

Focusing on a nearby object: Ciliary muscles contract, suspensory ligaments slack, lens more rounded
Focusing on a distant object: Ciliary muscles relax, suspensory ligaments contract, lens becomes flatter

Iris Reflex

In bright light: Circular muscles contract, radial muscles relax, pupil constricts, less light enters the eye
In dim light: Circular muscles relax, radial muscles contract, pupil dilates, more light enters the eye

Test your knowledge on the different structures of the eye and their functions. This quiz covers components such as the cornea, iris, retina, and the accommodation mechanism. Understand how these parts work together to enable vision.