Eye Flashcards
How many components are in the eye?
9
What are the components of the eye?
- Ciliary muscles
- Suspensory ligaments
- Iris
- Pupil
- Cornea
- Lens
- Optic nerve
- Sclera
- Retina
What are the ciliary muscles?
A ring of muscles that can change the shape of the lens, allowing the eye to focus light
What are the Suspensory ligaments?
A ring of fibres that connect ciliary muscles to the lens
What is the iris?
Controls pupil diameter
What is the pupil?
A hole in the centre of the iris which light passes through onto the retina
What is the cornea?
The transparent frontal portion of the eye responsible for refracting light
What is the lens?
The flexible structure located behind the iris which helps focus light onto the retina
What is the optic nerve?
Transmits visual information as electrical impulses from the retina to the brain
What is the sclera?
The white, protective, outer layer of the eye
What is the retina?
Full of receptor cells which are sensitive to both the brightness and colour of light
What is accommodation?
The process of the lens changing shape to focus on objects at different distances. This is done by the ciliary muscles and suspensory ligaments.
How does the eye focus on close objects?
- Ciliary muscles contract
- Suspensory ligaments loosen
- This causes the lens to become thicker and rounder
- Light becomes more refracted
How does the eye focus on distant objects?
- Ciliary muscles relax
- Suspensory ligaments tighten
- This causes the lens to become flatter and thinner
- Light becomes less refracted
What happens to the pupil in bright light conditions?
The pupil shrinks
