Look at the bottom of your bulb to identify if your instrument is 2.8v (blue - dry cell battery) or 3.6v (red - rechargeable)
Measure the length of the bulb as shown above. The length of a Proffesional Ophthalmoscope bulb is 24mm.
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.
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