| abstract |
A diagnostic indirect ophthalmoscopy lens device utilized for illumination and observation of the fundus of the eye may include a plus powered aspheric contact element and at least one anterior lens element which may also have aspheric surfaces and/or positive refractive power. The lens elements in combination act to illuminate and form an inverted aerial image of the fundus of the eye. A erecting optical system may be provided to reinvert the image produced by the lenses of the device, which facilitates examining or surgical procedures. The device may be a hand held device to enable easy manipulation, or may be a non-hand held device which maintains its position on the eye to be examined. The device may further include a separate source of illuminating light which allows proper illumination of the eye while avoiding reflections or the like. |