It has been determined that the "optical feeder" is a laser generator of a 650 nm semiconductor red laser source. So far, from the original source, both manufacturers and lawless elements who make huge profits to endorse manufacturers have deliberately avoided the word "laser" in their papers, calling it "low-energy red light" or "low-intensity red light", that is, 650 nm semiconductor red laser. Why? First of all, 650 nm semiconductor laser has caused secondary eye trauma to myopia children and adolescents, which will lead to major safety accidents of myopia children and adolescents in China; Secondly, the 650 nm semiconductor laser is essentially different from the natural light of the sun. 650 nm semiconductor red laser has extremely high thermal radiation energy density, strong monochromaticity and focus. 650 nm semiconductor red laser has the characteristics of tissue thermal energy accumulation and photochemical toxicity. Thirdly, according to the internationally recognized theory of shortwave light to prevent myopia, blue light, green light, yellow light and panchromatic natural light above 480 nm refracted by sunlight and natural light all belong to shortwave light, which can control the occurrence and progress of myopia, while 650 nm semiconductor red laser belongs to long-wave red laser, which accelerates the occurrence and progress of axial elongation and myopia. The conclusion is that long-wave red laser can not control the occurrence and development of myopia. The so-called "light feeding instrument", that is, 630-650 nm semiconductor red laser non-surgical treatment of myopia, has not been proved by any relevant national departments and international authoritative institutions, nor has there been any scientific demonstration and medical ethics recognition of animal experimental research and credible clinical medical scientific data.

The documents of the relevant national technical management departments clearly stipulate that "all acousto-optic products directly acting on human body must produce strict scientific theoretical data and animal experimental research data reports before further human clinical research can be carried out", but the manufacturer of optical feeder (650 nm semiconductor laser) directly uses the optical feeder (650 nm semiconductor laser) for the treatment of myopia of children and adolescents in China without going through the above procedures, which is illegal and has caused secondary eye injury of myopia of children and adolescents in China! International peer scholars have always firmly denied the scientific principle that 630 ~ 650 nm semiconductor laser will deliberately irradiate children and adolescents' eyes for a long time, no matter how low or stable the power is. At present, the relevant laws and regulations of developed countries such as North America, Western Europe and Japan strictly stipulate that such laser products or toys are not allowed or refused to be used in the eyes of children and adolescents.

After consulting a large number of international laser medical safety protection materials, the national laser medical safety protection manual of the United States and a large number of works of international colleagues and scholars, the author further found that academic colleagues agreed that the so-called 630~650 nm weak laser intermittently irradiated eyes for a long time "is not only unscientific, but also harmful to eyes, and there is a major accident in laser safety, which is absolutely unacceptable! The biggest threat and danger of "630~650 nm semiconductor laser" is that long-term irradiation or long-term intermittent irradiation will lead to retinal choroidal edema and congestion (eyes have no pain and discomfort, similar to X-ray examination), and laser can cause photochemical toxicity of retinal tertiary neurons and pigment epithelial cells. Pigment epithelial cells absorb laser with high energy density, which has the greatest photochemical toxicity and is the first to appear damage and degenerative diseases. Long-term, continuous or intermittent irradiation with "630~650 nm semiconductor laser" will lead to progressive apoptosis of retinal tertiary neurons and macular burn. Long-term irradiation can also lead to atrophy of retinal choroidal vascular system, adverse reaction of microcirculation system, hyperplasia of connective tissue between retinal choroidal tissues, and irreversible low vision caused by ischemia and hypoxia. At the same time, it should also be emphasized that the length of the human eye axis has a physiological dynamic fluctuation period. Intraocular fluid flows back out of the eye and exchanges substances every day. The refractive interstitial density and intraocular pressure of eyes fluctuate up and down within the physiological threshold, as well as the relaxation of ciliary body and the changes of choroidal space. Therefore, the so-called "630~650 nm semiconductor laser" can shorten the axis length and control the axis length. This is because merchants falsify data and fabricate pseudo-scientific fallacies in order to promote the "optical feeder", that is, the 630~650 nm semiconductor laser. In addition, the author himself is a key and general evaluation expert in the fields of myopia prevention and control, strabismus and amblyopia correction and ophthalmology of the National Natural Science Foundation of China. I consulted the relevant information of the key project of shortwave reflected light prevention and control myopia theory, so the problem came! The 650 nm semiconductor laser is a long-wave red laser, which theoretically accelerates myopia damage and causes irreversible damage to the third-order neurons, choroids and pigment epithelial cells in the retina of the eye. It is not the so-called "shortening the eye axis to treat myopia"! It even advocates that the cure rate is as high as 97.8%, which is the peak of data fraud! No ghost will believe it!

Therefore, in order to protect the eye health of the next generation of the Chinese nation and prevent it from being hurt again, every ophthalmologist and laser medical safety protection expert who insists on science and justice needs to whistle! We must resolutely crack down on pseudoscience! Say no firmly! Let's all respect science and pursue the truth, and at the same time call on the relevant state departments to seriously investigate the case of optical feedback, and also the so-called "optical feedback" pseudoscience essence and truth!