Learning Resources in Gresham

The parts of the eye all work together to help you see:

Step 1: Light enters the eye through the cornea, the dome-shaped clear surface of the eye.

Step 2: The iris (the colored part of the eye) adjusts the pupil (opening of the eye) in response to light, controlling how much light enters the eye.

Step 3: The lens focuses light inside the eye, working with the cornea to focus light directly onto the retina (tissue layer at the back of the eye).

Step 4: The retina detects light using photoreceptor cells, transforming properties like light intensity and color into electrical signals.

Step 5: The optic nerve transmits this visual information (as electrical signals) to the brain.

Step 6: The brain interprets visual information, becoming the images you see.

Refractive errors are the most common type of vision problem. The shape of the eye is essential to how light is focused inside it. When the eye is irregularly shaped, light is incorrectly refracted or reflected. Vision problems caused by refractive errors can be improved or corrected with treatment, including eyeglasses, contact lenses, and refractive surgeries.

Refractive errors include myopia, hyperopia, astigmatism, and presbyopia.