Optical Bench Accessories Object Needle, Mounted

Plane, circular, ground edges. Back silvered with protective coating

A unique apparatus that allows you to recreate the conditions of visual deficiencies in the human eye..

Consists of clear silicone elastic lens chamber, filled with water
When water is added or removed with the included syringe, the curvature of the lens is changed, which alters the focus of images projected on the retina
Adjustable eyeball shape
Lenses can be added to show how vision defects can be corrected
Five-piece model mounted on a base with the projection object on a separate stand
Supplied complete with two lenses, lens holder and instruction manual