Hand held tonometer with improved viewing system
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Accused Products
Abstract
A puff tonometer in which the eyepiece and objective lens form a simple telescope which is capable of presenting to the user an in-focus image of distant objects, as well as an image of light reflected by an eye under test at close quarters when viewed through the eyepiece. A Pechan-Schmidt prism inverts the image and presents to the user an image of the patient'"'"'s eye which is correctly oriented and handed in a vertical and horizontal sense. The focal length of the eyepiece typically lies in the range 62-100 mm, preferably 80 mm.
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Citations
46 Claims
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1-36. -36. (cancelled).
- 37. A hand-held air impulse tonometer comprising an eyepiece, an objective lens and puff tube assembly and a source of illumination for directing light through an objective lens towards a patient'"'"'s eye under test, wherein the eyepiece and the objective lenses form a simple telescope which is capable of presenting to the user an in-focus image of distant objects, as well as light reflected by the eye under test at close quarters, in the field of view seen by the user through the eyepiece.
Specification