Structure of the eyeball วัตถุประสงค์ ... - บอกโครงสร้างสำคัญของตาได้

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Structure of the eyeball วัตถุประสงค์ ... - บอกโครงสร้างสำคัญของตาได้

Structure of the eyeball

Iris & Pupil Diaphragm Constriction Light reflex Exclude periphery of the lens Increase depth of focus Light reflex Direct & consensual dilate - 15-20 seconds (dim light) constrict - 3-4 seconds (bright light)

Intraocular Pressure - Ciliary body aqueous humor anterior chamber trabeculae canal of Schlemn (venous channel) - 10 - 20 mmHg - Glaucoma - Open-angle (wide angle) - Angle-closure (narrow angle)

Lacrimal glands … Roles of the Eye … Lubrication - lid movement Good optical surface Wash out noxious agents Lysozyme - bactericidal action … Roles of the Eye … Optical instrument - retinal image Physical mechanism Sensory receptor - nerve impulse Physiological mechanism

Protective Mechanisms Bony wall of the orbit Eyelids Protective eyelid closure reflexes; corneal, dazzle, menace reflexes Spontaneous blinking Tonic contractions of orbicularis - during sleep Voluntary lid closure Eyelashes (cilia) - Blink reflex

Resources : 2. Formative evaluation I 1. VDO files - The Human eye 6:20 The important parts of the eye (cornea, iris, pupil, eye lens, retina, blind spot) Accommodation of the eye and Power of accommodatiom Near point, Far point of the eye, cataract Range of vision https://www.thevisualmd.com/read_videoguide/?idu=1083619287 2. Formative evaluation I

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