Vision science is the science dedicated to the interdisciplinary study of visual perception and the visual system. Vision scientists study various aspects of vision from the perspectives of cognitive psychology, neuroscience, computer science, psychophysics, and optometry.

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Light enters the eye from an external medium such as air or water, passes through the cornea, and into the first of two humours, the aqueous humour. Most of the light refraction occurs at the cornea which has a fixed curvature. The first humour is a clear mass which connects the cornea with the lens of the eye, helps maintain the convex shape of the cornea (necessary to the convergence of light at the lens) and provides the corneal endothelium with nutrients.

The iris, between the lens and the first humour, is a coloured ring of muscle fibres. Light must first pass though the centre of the iris, the pupil. The size of the pupil is actively adjusted by the circular and radial muscles to maintain a relatively constant level of light entering the eye. Too much light being let in could damage the retina; too little light makes sight difficult. The lens, behind the iris, is a convex, springy disk which focuses light, through the second humour, onto the retina.

In October he returned, not because his eye was not doing well, but because he was afraid he might be "straining" it. On the contrary, the reading of fine print, when it can be done without discomfort, has invariably proven to be beneficial, and the dimmer the light in which it can be read, and the closer to the eyes it can be held, the greater the benefit. 56 Accommodation: Study of Images Fig. If it tries to do so, it begins to 159 160 Shifting and Swinging strain and the vision is lowered. In this case no change was observed in the cornea. I have just removed the extra piece for near vision from these extra lenses.

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