| 摘要 |
<p>A diagnostic indirect ophthalmoscopy lens device utilized for illumination and observation of the fundus (34) of the eye may include a plus powered aspheric contact element (10) and at least one anterior lens element (16) which may also have aspheric surfaces and/or positive refractive power. The lens elements (10, 16) in combination act to illuminate and form an inverted aerial image of the fundus (34) of the eye. An erecting optical system (150) 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 (200) which allows proper illumination of the eye while avoiding reflections or the like.</p> |
