HBS eyes

Cornea

Controls and focuses the entry of light

Iris

Muscles control the pupil, how much light enters

Cornea

Controls and focuses the entry of light

Iris

Muscles control the pupil, how much light enters

Pupil

Changes size to allow more or less light in

Sclera

Maintain shape and protect from injury

Retina

Senses light and sends signals to the brain

Lens

Bends (flexible) to focus light on retina; allows us to see at varying distances

Aqueous humor

Gives eye shape and nutrients

Vitreous humor

Directs light for clear vision, shock absorption, shape and nutrients

Tapetum

Not in humans, reflects light in animals

Blind spot

The spot in our retina where the optic nerve connects (no light sensitive cells)

Optic nerve

Sends visual images to the brain

Astigmastism

• squinting

• blurriness/double vision

Misshapen cornea/lens

Glaucoma

• Blind spots in peripheral vision

• problems with central vision

pressure from the aqueous humor against the optic nerve

Traumatic iridiodialysis

• photophobia

• eye bleeding

Iris separates from ciliary body due to blunt or penetrating damage

Diabetic retinopathy

• Blurry vision and black floaters

high blood sugar blocks the blood vessels that go to the retina

Retinitis pigmentosa

• problems with night vision + tunnel vision

Inherited: recessive and dominant