eye and perpous

1. Cornea

   • Purpose: The clear, dome-shaped surface that covers the front of the eye. It helps to focus light as it enters the eye.

2. Pupil

   • Purpose: The dark circular opening in the center of the iris. It controls the amount of light that enters the eye by changing size (dilating or constricting).

3. Iris

   • Purpose: The colored part of the eye that surrounds the pupil. It controls the size of the pupil and thus regulates the amount of light that enters the eye.

4. Lens

   • Purpose: Located behind the iris and pupil, the lens focuses light onto the retina. It can change shape to focus on objects at varying distances, a process called accommodation.

5. Retina

   • Purpose: The light-sensitive tissue at the back of the eye. It converts light into electrical signals that are sent to the brain via the optic nerve. The retina contains photoreceptor cells called rods (for low-light vision) and cones (for color and detailed vision).

6. Optic Nerve

   • Purpose: The nerve that transmits electrical signals from the retina to the brain, allowing us to perceive vision.

7. Sclera

   • Purpose: The white, outer layer of the eye that provides structure and protection. It also serves as an attachment point for eye muscles.

8. Choroid

   • Purpose: A layer of blood vessels located between the retina and sclera. It provides oxygen and nutrients to the retina.

9. Vitreous Humor

   • Purpose: The clear, gel-like substance that fills the space between the lens and retina, helping to maintain the eye's shape and allowing light to pass through to the retina.

10. Aqueous Humor

• Purpose: The fluid in the front part of the eye, between the cornea and lens. It nourishes the eye and helps maintain intraocular pressure.

11. Ciliary Body

• Purpose: The structure behind the iris that produces the aqueous humor and controls the shape of the lens for focusing.

12. Macula

• Purpose: The small, central part of the retina responsible for sharp, detailed central vision. It contains a high concentration of cones.

13. Fovea Centralis

• Purpose: A small pit in the center of the macula that is responsible for the sharpest vision, as it has the highest density of cones.

14. Conjunctiva

• Purpose: A thin, transparent membrane that covers the white part of the eye and the inside of the eyelids. It helps keep the eye moist and protects it from foreign particles.

Color deficiency, often referred to as color blindness, is primarily caused by a lack of functional cones in the retina of the eye

Same: Both saw it as involving objects emitting light

Different: Pythagoras had a which all objects emit light , while Plato combined eye-lights and tied the process to deeper metaphysical ideas