Vision Drum

A vision drum, also known as a prism bar or lens drum, is an optical instrument used by eye care professionals to measure and assess refractive errors, including the degree of astigmatism, myopia (nearsightedness), and hyperopia (farsightedness). It consists of rotating cylindrical lenses or prisms mounted on a drum-like structure.The vision drum is often used in clinical settings, particularly in vision testing for astigmatism or other refractive issues. By rotating the drum and switching between different lenses or prisms, the examiner can quickly determine the correct prescription for eyeglasses or contact lenses.

Key Features

Rotating drum:The main part of the instrument is a cylindrical drum with several lenses or prisms of varying strengths that can be rotated into position in front of the patient’s eye.
Cylindrical lenses or prisms: These lenses or prisms help measure how the eye refracts light, allowing the examiner to determine the patient’s refractive error. In the case of astigmatism, cylindrical lenses are used to assess the curvature of the cornea.
Range of powers: The vision drum typically includes lenses or prisms with different diopter values, which can be adjusted by rotating the drum to match the patient's prescription.
Accurate measurements: The vision drum allows for precise measurement of refractive errors without requiring a full phoropter. This is especially useful for quick refractions or in cases where a simpler instrument is needed.

Vision Drum

Key Features

Headquarters

Regional Offices

Warehouses

Representatives

Vision Drum

Home / Vision Drum

Vision Drum

Key Features

Headquarters

Regional Offices

Warehouses

Representatives