. Elements of human physiology. Physiology. )50 PHYSIOLOGY Section 6 VISION In treating of the functions of the eye, the organ of vision, we have to consider the essential part, the termination of the optic nerve or retina, and the accessory part, a series of dioptric mechanisms, arranged to form a perfect image of external objects on the retina. Since the two eyes are generally employed together, we have also to discuss binocular vision ; and lastly the cerebral processes engaged in the formation of visual sensations and judgments. The Manner in which a Distinct Image of External Objects is f
. Elements of human physiology. Physiology. )50 PHYSIOLOGY Section 6 VISION In treating of the functions of the eye, the organ of vision, we have to consider the essential part, the termination of the optic nerve or retina, and the accessory part, a series of dioptric mechanisms, arranged to form a perfect image of external objects on the retina. Since the two eyes are generally employed together, we have also to discuss binocular vision ; and lastly the cerebral processes engaged in the formation of visual sensations and judgments. The Manner in which a Distinct Image of External Objects is formed on the Retina The eye may be compared to a photographic camera, the lens ))eing represented by several refracting surfaces, the Fig. cornea, lens, and vitreous humour, and the sensitive plate on which the image is formed by the retina. A ray of light when passing obliquely from a medium of low density (such as the air) to a medium of high density (such as water or glass) changes its course, being bent towards the perpendicular drawn to the surface separating the two media. On leaving the dense for a rarer medium it is bent once more away from the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Starling, Ernest Henry, 1866-1927. Chicago : W. T. Keener
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectphysiology, bookyear1
