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| FUNCTIONAL HUMAN EYE
(2882) |
| This Functional Human Eye 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 hypermetropia [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; near-point 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 hypemetropia (lenses and lens holder included). Complete with illustrated instructions and projection object on stand with numbered Key Card. |
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