Keeler 1102-P-1033 Pocket Ophthalmoscope Head and bulb 2.8v All Keeler instruments use genuine Halogen and Xenon technology, yielding a brighter, whiter illumination and a longer life. Look at the bottom of your bulb to identify if your instrument is 2.8v (blue - dry cell battery) or 3.6v (red - rechargeable) Accurate diagnosis depends upon a number of factors. Of these, top quality illumination ranks as one of the most important. Only excellent visualisation allows you to use your diagnostic skills to the full. Wide Angle - Illuminates the largest area of fundus for the best possible general diagnosis through a dilated pupil. Intermediate - Permits easier access through an undilated pupil and in peripheral examination. Particularly useful in paediatric examination. 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 primarily to determine retinal elevations and depressions but may also be used to assess anterior chamber depth. Fixation Cross - Projects a graticule onto the retina for assessment of the degree and direction of eccentric fixation. Red Free - The red free filter is used to examine blood vessels in fine detail. By filtering out the red light, blood vessels are silhouetted black against a dark green background. Contents: Pocket ophthalmoscope Spare bulb