Today, we will discuss the basic structure of the human eye.
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Lens: For focusing of objects onto the
retina.
•
Iris: Controls the amount of light
entering the eye by changing the size of the pupil.
•
Pupil: This is the aperture (hole)
bounded by the iris.
•
Retina: The back of the eye where the
image is formed. Contains the light sensitive structures rods and cones.
•
Rods: Needed for night vision since they
are very sensitive to light. Helps to distinguish between black and white
objects.
•
Cones: Needed for day time vision and for
distinguishing between colors.
•
Optic nerve: Transmits the image from the
retina to the brain.
- The lens divides the eye into anterior and posterior chambers. The anterior chamber contains the fluid called aqueous humor and the posterior chamber contains the gel-like substance called the vitreous body.
- The ciliary muscles control the thickness of the lens. That is, it stretches the lens.
- The Canals of Schlemm drain the aqueous humor.
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