|Power Source||3.6 V Bulb|
|Model Name/Number||Beta 200|
|Battery Source||Lithium Battery|
|Color||Black and Silver|
|Packaging Type||Box Packing|
A retinoscope works by shining a beam of light into the eye and observing the reflection of the light as it bounces back from the retina. By observing the movement and direction of the reflected light, an eye care professional can determine the refractive error of the eye, which is a measure of how well the eye can focus light.