The trial frame is one of the basic tools for optometry and optometry. It must be used for each optometry. The trial frame has a

spectacle frame type frame, and two audition sitting feet are respectively arranged on the front of the two circles of the frame.

The trial frame is used after the subjective optometry with the comprehensive refractometer. Although the results obtained by

the comprehensive refractometer have been more accurate, it must be properly adjusted with the trial frame technology,

because the trial frame is closer to the actual wearing situation than the comprehensive refractometer. 

Here are some reasons why the trial frame is needed after the subjective optometry of the comprehensive refractometer:

1. Brightness

Since the comprehensive refractometer is generally used in the consulting room, the background brightness is dark during

subjective optometry, and the optometry results obtained at this time are suitable for the dark brightness conditions. In real life,

the brightness of the patient is changeable, so it is necessary to wear trial frame at this time and ask the patient to experience

the feeling under different brightness. Such as fear of light, glare, etc., and adjust it appropriately.

2. Lens shape

The size and aberration of the lens in the peephole of the comprehensive refractometer are different from the actual frame and

lens.In addition, when the patient is located behind the peephole of the comprehensive refractometer, he looks straight ahead.

When wearing the trial frame, he can experience the surrounding conditions of the lens and know whether there is deformation

and dizziness when looking at the object through eye rotation.