One of the most common low vision aids is the hand-held telescope, also called a monocular. Hand-held telescopes come in a wide variety of sizes, magnification powers and prices. Monoculars work best to quickly view a distant object, such as reading a sign or locating an object.

If you wear glasses, make sure to put them on before using a monocular and you should gently rest the rubber end on your glasses.

Make sure to have a clear view of what you are watching. Hold the monocular very close to your eye (not touching it).
You should see light if the monocular is properly lined up with your pupil. You can steady the monocular and hold it in place by placing your index finger on your eyebrow and your thumb on your nose.

Focus the monocular by putting your other hand on the ridged section of the monocular and turning it until your image becomes clear. If the image becomes blurry, this is a sign that you have turned the ridge too far. Begin turning the ridge in the opposite direction if this occurs.

If the image is still blurry, move closer to the object you are viewing and refocus the monocular.
Monoculars with very close-focus viewing capabilities are favored by those with low vision impairments or butterfly watchers.