Скачать или смотреть 4 Dot Test Light W4LT with Red Green Glasses Torch

Rechargeable battery built inside;
Red/Green Glasses and one pen light included;
Nice case for safe storage.
Strabismus Amblyopia Optometry Worth 4 Dot Test with Red Green Glasses
Product manual:
The four round hole-shaped lights of the inspection surface of the lamp are arranged in a prismatic shape. Horizontal two for the green, vertical two (above the red) side for the red, the bottom is white. Check the inspectors to bring red and green glasses. In accordance with the habit, the general right eye for the red lens, left eye for the green lens.

Optometry equipment from Shenzhen AIST Optics
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