Which brand of photonometer is the best now? Safest?

The mammography devices currently on the market (October 25, 2021) with Class II medical device certificates are: Aerxing, Longda, Yishiliang, and Sangenren.

Which is the safest: The above four brands all have national Class II medical device licenses, so there is not much difference in safety.

Which one is the most effective: The basic principles of the four brands are the same, and they are all effective in theory. However, due to individual differences in children, some children will not have ideal results. The reasons for unsatisfactory results have a lot to do with the child's development, genes, intensity of eye habits, and whether the equipment is used correctly.

3. Difference: Here we only talk about the more familiar popular products:

Yishiliang: The brand inventor is Professor Jiang Shunfu and Professor Zhu Ping, one of the founders of laser medicine in China, jointly developed . The advantage of this camera is that the internal and external lasers are used alternately. The theory is: after the internal laser has controlled the axial length of the eye, the external laser can be used for prevention and control. They are used alternately, and Chinese and Western medicine interact with each other.

The new generation of Yishiliang adds 3 levels of laser intensity adjustment to the original, which is equivalent to covering the red light intensity of all mammograms on the market.