The Eye. The Eye focuses light rays to produce objects The Eye focuses light rays to produce objects.

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Presentation transcript:

The Eye

focuses light rays to produce objects The Eye focuses light rays to produce objects

The Brain The eye is connected to the brain via the optic nerve. Images are interpreted by the occipital lobe

Neuron Interneurons carry the message along the optic nerve to the brain.

slightly longer than wide round slightly longer than wide eyeball

1. Sclera - outer protective layer 3 layers of tissue 1. Sclera - outer protective layer cornea aqueous humor * Cornea - lets light in (clear) * Aqueous Humor - fluid filled chamber

2. Choroid Layer Middle layer that contains blood vessels * iris - colored portion of eye *pupil - opening through which light enters * lens - focuses light rays * vitreous humor - jellylike fluid, gives round shape

3. Retina Light is focused here

* Located in the retina Rods - react to dim light Rods & Cones * Located in the retina Rods - react to dim light Cones - responsible for color vision, don’t work in dim light

Image that appears on retina is upside down

The Brain must turn right side up

Eye Structure sclera choroid optic nerve cornea pupil retina lens iris vitreous humor aqueous humor

External Eye pupil sclera iris

convex lens converges hypermetropia = farsightedness

concave lens diverges There is a “cave” near the school = nearsightedness myopia