Lesson 1. IRIS  colored part of the eye  controls the amount of light entering, which changes the size of the pupil 

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Presentation transcript:

Lesson 1

IRIS  colored part of the eye  controls the amount of light entering, which changes the size of the pupil 

 The white part of the eyeball is called the sclera. The sclera is made of a tough material and has the important job of covering most of the eyeball. Think of the sclera as your eyeball's outer coat.

 The natural adjustment in the size of the pupils is called the iris reflex, which is extremely rapid.  This iris reflex action the pupil when you automatically adjusts go from a darkened area to a well-lit area, or, from a well- lit area to a darkened one.

 Look very closely at the white of the eye, and you'll see lines that look like tiny pink threads. These are blood vessels, the tiny tubes that deliver blood, to the sclera.

 The part of the sclera in front of the colored part of the eye is called the cornea. The curved and transparent layer of the sclera at the front of the eye.

Pupil  Hole that light enters

Retina  Photoreceptor cells in the retina detect light (rods are highly sensitive to light and cones detect color) ..

Ciliary Muscles  Contract to lengthen the lens and relax to shorten the lens

Vitreous Humour  The eyeball contains fluids, called humours, which prevent the eyeball from collapsing and refract the light that enters the eye.

 Rods see in black, white, and shades of gray and tell us the form or shape that something has.

 Cones sense color and they need more light than rods to work well. Cones are most helpful in normal or bright light.

 The lens in the human eye is a convex lens, which focuses the light rays entering your eye to a point on your retina.  Some people however have eyes that are too long or too short.

 If the eye is too long, the image forms in front of the retina  trouble seeing distant objects

 If the eye is too short, the image forms behind the retina  Objects that are close to them are difficult to see

 The shortest distance at which an object is in focus is called the near point of the eye.  The longest distance is called the far point of the eye.  On average, an adult has a near point of about 25 cm, whereas babies have a near point of only 7 cm.  The far point is infinite.