LO6 Flashcards
What is the pupil?
Is the opening in the middle of the eye through which light passes
What is the iris?
Is the visible coloured ring at the front of the eye. It adjusts to control the amount of light that entering the eye through the pupil
What is the tear glands?
(-Lacrimal glands) produces tears to clean and lubricate the front of the eye.
-The fluid contains salt and has natural antiseptic properties to defend against infection
What is the aqueous and vitreous humours?
The watery, jelly like fluids that fill the eye. They keep the eye in shape and nourish it.
What is the conjunctiva?
Is a thin membrane that protects the cornea
What is the cornea?
Is at the front of the eye and is transparent.; light rays pass through the cornea to the retina.
What is the retina?
Is the inner lining of the eye and contains light sensitive cells called rods and cones
What is the macula?
Has a very high concentration of photoreceptors cells; these detect light and send signals to the brain, which interprets them as images.
What is the optic nerve?
Where the nerve cells exit the eye.
What is the Ciliary muscle?
Enables the lens to change shape for focusing, it contracts to stretch the lens making it flatter and thinner
What is suspensory ligaments?
Attach the lens to the ciliary muscle
What is the lens?
Focuses light entering the eye
What is glaucoma?
An eye condition where the optic nerve, which connects the eye to the brain, becomes damaged.
What are the causes of glaucoma?
-build up pressure in the eye when fluid aqueous humour is unable to drain properly. This damages the optic nerve.
-certain things can increase the risk such as age ethnicity, family history and diabetes.
What is age related macular degeneration? AMD
Affects the middle part of the eye