Cat. no.

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
hypermetropia (lenses and lens holder included). Complete with
illustrated instructions and projection object on stand with numbered
Key Card.