PHY2011 Lecture Notes - Lecture 16: Choroid, Refraction, Phosphodiesterase
20 Jun 2018
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Week 6 L2 (T4L3) -Peripheral visual system
Type 3 sensory system: specialised receptor cell that communicate with intermediate cells
that communicate with nerve fibres
Three layers:
oSclera -hard, but becomes transparent in front of lens
oChoroid -middle bit, forms ciliary body that has ligaments that hold the lens, and the
iris -two layers of muscle that controls how much light goes in
oRetina -inner bit, contains receptor cells
Role of accessory structures (everything but the retina & the light receptor cells)
o(1) Focusing: Refraction & Accommodation
o(2) Protection: Regulation of light entry
o(3) Image quality: Reduction of spherical aberration
(1) Focusing: refraction & accommodation
oConvex lens: brings light wave at a focal point
oConcave lens: diverges light waves outwards
oRefraction locations in the eye: where the medium changes
Air-cornea
Aqueous Humour - lens
Lens – Vitreous Humour
oCommon refractive errors
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