Keeler Professional Ophthalmoscope 3.5v Total Control at your Fingertips The Professional Ophthalmoscope has been designed to ensure ultimate control. Lenses, graticules and filters can all be introduced at the touch of a fingertip without the need to pull away from the patient.   Xenon illumination The Professional also uses Xenon illumination for a brighter and whiter long lasting light, giving you more power and fewer bulb changes. Positive action maywheel and comprehensive lens range The positive action easy access maywheel not only allows you to dial up the required lens quickly, but also gives you total control of where you are in the lens range making each exam quicker and easier. The extensive range of +29D to –30D in single diopter steps ensures easy examination of all ocular structures and covers a wide range of patient/user prescriptions. A quick step swing of +/- 20D helps speed up diagnosis. Swing over filter The red free filter for enhanced vessel examination can be used in conjunction with any of the 6 diagnostic beams. Brow rest The integral soft brow rest allows for easy positioning and protects your lenses if you are a spectacle wearer. Apertures / Filters: Xenon Illumination Unique orbital fit Contoured for optimal field 6 beams +29D to -25D lens range - 1D steps Clear retinal views Wide Angle Largest beam for largest illuminated area for best general diagnosis. Intermediate A slightly smaller beam also for general diagnosis but where excessive pupilliary reaction encountered. Also for use with children or photophobic patients and for viewing the peripheral retina. Macular Designed specifically for examination of the macular region of the fundus where a larger beam would create excessive pupillary reaction or patient discomfort. Slit Used to diagnose retinal elevations or depressions. (the beam distortion can be demonstrated by shining the slit beam across a pencil lying on a table). Glaucoma For assessing Cup / Disc ratio in the diagnosis and monitoring of Glaucoma. Eccentric Fixation A difficult one to describe but essentially used for detecting Eccentric Fixation. Red Free The red free beam is just that i.e. white light with all the red taken out ending up green! When shone in the eye it makes the blood vessels stand out almost black against a grey/green background making detailed examination of the blood vessels much easier.