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Functional Human Eye Model, 12" x 7"

Item # 694520

This remarkable, functional model of the human eye demonstrates the way the lens thickens or flattens to focus an image on the retina. The actual lens is a chamber constructed of optically clear silicone elastomer connected by tubing to a water-filled syringe. Water forced into the lens increases its thickness and curvature; withdrawal flattens the profile of the lens, changing its focus.

Price

$530.50

This item will ship on or about 6/23/17

This remarkable, functional model of the human eye demonstrates the way the lens thickens or flattens to focus an image on the retina. The actual lens is a chamber constructed of optically clear silicone elastomer connected by tubing to a water-filled syringe. Water forced into the lens increases its thickness and curvature; withdrawal flattens the profile of the lens, changing its focus.

The “shape” of the eye can also be altered to simulate myopia (nearsightedness) and hyperopia (farsightedness). Used in conjunction with a bright light source (such as an ordinary slide projector), images can be focused on the model’s retina. You can dramatically demonstrate visual accommodation; nearpoint of vision; visual blind spot; presbyopia (age-related loss of accommodation from lack of lens elasticity); and the use of corrective lenses to treat myopia and hyperopia (lenses and lens holder included).

Complete with illustrated instructions and projection object on stand. Size, 12 × 7".

 

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