Manual Lensometer can be defined as an instrument used by an optometrist to find the back-vertex or the front vertex power of the eyeglasses. A manual lensometer is portable and can be carried anywhere. But a person needs to have a better idea to measure the power of a lens.

It is a fully automatic well-programmed device primarily used in clinics. It is easy and faster and can print prescriptions. It is less accurate when compared to a manual lensometer.