The eye

• Pupil: allows light into the eye
• Iris: controls the size of the pupil
• Lens: focuses light onto the retina
• Retina: Detects light using cells called photoreceptors
• Optic Nerve: receives signals from the retina and sends them to the brain
• Sclera: protects the eye and helps it maintains its shape
• Choroid: contains blood vessels, which brings nutrients to the eye
• Cornea: protects the front of the eye
• Vitreous Humor: Helps the eye maintain it's shape
• Aqueous humor: brings nutrients to the cornea and lens which lack blood vessels
• Cilary muscle: controls accommodation for viewing objects and varying distances