1. Function Introduction
This device is divided into two models, A and B, in which A is standard model
and B is strengthened model with prism compensator.
In the following description, all sections or content marked with “*” before them are
specialized content of model B device.
Optic, machine and microelectronic integrated technologies are adopted in this device,
where, yellow liquid crystal display is available to achieve stable and precise measuring
result, proven to be an ideal device for having one’s eyesight tested for spectacles.
This device is applicable to all level measurement testing departments, spectacles
manufacturers, spectacles retail stores, hospital’s department of ophthalmology
and optical elements factories for conducting measurement of spherical lens diopter
of spectacles or lens, diopter of cylindrical lens, astigmatism axis angle of cylindrical
lens, diopter of bifocal lens, prism degree and prism basal angle.
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2. Working Principle of Device
Fig. 1 Drawing of Optical Principle for Model A
Fig. 2 Drawing of Optical Principle for Model B
1. Light source 2. Mark Dividing Plate 3. Measurement Objective
4. Diaphragm 5. Telescopic Objective 6. Eyepiece Dividing Plate
7. Eyepiece Set *8. Prism Compensator
