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light enters eye through pupil. Iris will constrict or dilate to help control amount of light. Light goes through lens, which refracts light to retina. In low light tampetum reflects more light to retina.
Parts of the eye Figure 5.1 shows the physiology of a human eye. The shape is approximately spherical, with a diameter of around 24mm and only slight vari-ation among people. The cornea is a hard, transparent surface through which light enters and provides the greatest optical power (recall from Section 4.4).
Functions: Distribute tears, clear debris, cover eyes during sleep & prevent evaporation, protect from foreign bodies via the blink reflex
Ocular Anatomy and Physiology Introduction By the end of this chapter you will be expected to possess knowledge and understanding: • Of the gross anatomy of the human eye • Of the physiology of the human eye (how the structures function) • Of the relation to the eyes and function of extraocular structures • Of the function of tears
THE EYE •The adult human eye averages 24 mm in diameter (at birth it is 16 mm) •The globe has 3 membrane: –anterior (cornea and sclerotic); –medial (uveal tract); –posterior (retina).
BASIC ANATOMY OF THE EYE, ADNEXA AND VISUAL PATHWAYS 1.1 Basic Anatomy Learning Objectives Understand the basic anatomical structures of the globe. The external structure of the globe comprises the sclera (outer most layer), uveal tissue (middle layer) and retina (innermost layer). Refer to Fig. 1.1. Sclera
someone's eyes is the color of the iris. The iris regulates the amount of light that enters the eye through the h. le in the iris' center, called the pupil. Muscles in the iris open the pupil more to allow light when in a dark environment such as a movie theatre or close the pupil in brig.
