Eye Anatomy and Function. Cornea Transmission of light Refraction of light: +42 dioptres.

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Presentation transcript:

Eye Anatomy and Function

Cornea Transmission of light Refraction of light: +42 dioptres

Aqueous Humour Functions Nutrition of the (avascular) cornea and lens Maintenance of the intra-ocular pressure include:

Ciliary Body Secretion of aqueous humour: Ciliary epithelium Accommodation. Ciliary body smooth muscle Attachment of zonules (suspensory ligament of the lens)

Crystallin

(Crystalline) Lens Composed of α, β, and γ crystallins (water soluble proteins) Transmission of light Refraction of light. +17 dioptres Variable refraction of light - accommodation

Retinal Function Conversion of light to electrical impulses Cones. 6 million. High threshold to light, high acuity, colour vision- 3 types of cones: red, green, blue. Rods. 120 million. Low threshold to light (sensitive). Sensitive to movement. No colour. Low resolution. Optic nerve. 1 million fibres.

Spectral sensitivity ranges (nm) S M L

Optic nerve head (Masson’s trichrome)

The Uveal Tract the eye’s vascular and immunological pool Iris. Variable size of pupil (iris diaphragm) with light level with nearness of fixation Ciliary Body. Aqueous, accommodation, zonule Choroid. Nutrition of retina and sclera The most vascular tissue in the body

Extra-ocular muscles Medial rectus. Adducts. Lateral rectus. Abducts. Superior rectus. Elevates. Inferior rectus. Depresses. Superior oblique. Intorts. Depresses, abducts. Inferior oblique. Extorts. Elevates, abducts.

Intra-ocular lens