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Lecture 4

PSYB51H3 Lecture Notes - Lecture 4: Vitreous Body, Sclera, Cornea


Department
Psychology
Course Code
PSYB51H3
Professor
Matthias Niemeier
Lecture
4

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LECTURE 2
Light Physics
o Light
o Definition
A wave (electromagnetic wave), a stream of photons, tiny particles that
each consist of one quantum of energy
o Light can be absorbed, diffracted, reflected, transmitted, or refracted
o When light is absorbed
Energy is absorbed and transformed to other forms of energy (solar
panels)
o When light is transmitted
Light is conveyed from one place to another through a transparent
medium (light filters)
o When light is reflected
Energy is redirected as it strikes a surface (Purkinje reflections, eye
movements)
o When light is refracted
Energy is altered as it passes into another medium (light that enters
water from the air)
o When light is diffracted
Energy that is bent or has waves that get spread out as they encounter an
obstacle (passing through a narrow aperture)
Parts of the Human Eye
o Sclera
o The white of the eye
o Cornea
o Front part of the sclera becomes transparent
o Bulges out
o Aqueous Humour
o Behind the cornea
o Cavity filled with liquid substance
o Pupil
o The hole in the iris
o Iris
o Coloured part of the eye
o Lens
o Structure that further contributes to reflection of light
o Flexible (can be fat or stretched apart)
o Ciliary Muscle
o Flexes the lens by pulling it
o Zonules of Zinn
o Pulls the lens to change its shape
o Vitreous humor
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