. Bulletin : report of Agricultural Experiment Station, Agricultural and Mechanical College, Auburn, Ala. Agriculture -- Alabama. 45 or permanent amaurosis. If, in the course of intlamation, if the retina pigment is deposited in the retina, it produces night blindness—a condition that prevents the animal seeing at night. Extreme sensitiveness of the retina, as observed in Albinos and in some white horses, leads to day blindness. In such cases, the pupil is so nearly or completely closed that the animal can not see in clear sunshine, or when the ground is covered with snow; but during twilight,
. Bulletin : report of Agricultural Experiment Station, Agricultural and Mechanical College, Auburn, Ala. Agriculture -- Alabama. 45 or permanent amaurosis. If, in the course of intlamation, if the retina pigment is deposited in the retina, it produces night blindness—a condition that prevents the animal seeing at night. Extreme sensitiveness of the retina, as observed in Albinos and in some white horses, leads to day blindness. In such cases, the pupil is so nearly or completely closed that the animal can not see in clear sunshine, or when the ground is covered with snow; but during twilight, on cloudy days, and at night vision is normal. Amaurosis sometimes results from Fig. 14. Amaurosis.—The pupil is greatlj- expanded, gray-blue in color and the eye appears bright, glassy, very clear (after Armatage . In well established cases of amaurosis there is total blind- ness; yet there are no opacities in any of the tissues or humors of the eye. The eye is bright, clear, and perfectly transparent. The animal steps high, stumbles over, and runs against objects in its way. If, at a short distance, you noiselessly threaten to strike it, there is no winking or manifestations of fear. The ears are very sensitive to sound, and the outer ears ar« constantly on the alert to catch all noises. The pupil is expanded to its extreme limit; the iris is immovable and insensitive to ligfht. Leailing the animal from the dark into the light, or from the light into the dark, does not change the size of the pupil or move the iris; while in the normal eye the pupil ex[)ands in darkness. 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 Agricultural and Mechanical College of Alabama. Agricultural Experiment Station. Auburn, Ala. : The Station
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