This product is suitable for the checking of myopia and hyperopia in school, hospital and other relevant departments.
 
The front frame of the visual chart is made of high-strength aluminum alloy, matched with highly-clear board of the visual signs. The box body is wholly made of high-quality steel plate and is of static spray coating. It is superb in design and durable to use. The visual signs are in great contrast and highly clear, ensuring an exact checking result.
 
A fluorescent lamp is the light source. The light box is equipped with an electronic ballast. It can function normarlly under low voltage, with steady illumination and no flash. Maintenance is simple. By opening up the front frame, circuit checking and fluorescent lamp changing can be done right away.
 
The light box has two specifications of testing distances: 2.5m and 5.0m.