This paper describes an Ar+ laser used for measuring MBD60 for the skin of the yellow race. The skin erythematous reaction threshold level at 488.0 nm and 514.5nm for two groups of volunteers are measured. The skin of the volunteers is exposed to the above energy densities, and histological examination finds that capillaries are expanded and filled with erythro-cytes and light edema, but there is no significant change of the cuticle.

According to the animal and human skin experiments the result of the injury threshold of CW Nd: YAG laser of Chinese human skin are: MBD50 of relatively white people, 65.519 J/cm2, yellow people 60.989 J/cm3, relative black people 52.321J/cm2. It was proved that the amount of skin pigment is closely related to the absorpsion of Nd:YAG laser light.

This paper reports experimental results of human skin exposed to ruby laser light. Bystatistical analysis of the erythema produced with 24 hours post-exposure, EDso about 4.7J/cm2 was obtained.

Acute injury threshold lelvel MRD50 of CO2 laser light for the skin of eight white piggies was measured. On the basis of the animal experiment, the same measurement for the skin of six yellow people, was made. MED50 was found to be 2.3 J/cm2. The skin of 5 volunteers was exposed to the above energy densities,and histologieal examination found that capillaries are expanded and filled with erythrooytes and light edema, but there is no significant change of cuticle. This indicates that the MBD50 erythematous reaction is minimal and reversible.

Investigation of ultraviolet erythema of the skin irradiated with 265 nm pulsed laser was presented. Two phases of reactions of ultraviolet erythema-immediate and delayed ones were clearly observed in our experiment. The probability statistical analysis indicated that minimal dose of 50% perceptible redness oecurence rate on the porket skin (22.00 mJ/cm2) is fiducial.

This paper reports the research results on laser injury threshold of skin irradiated by 200s pulsed Nd glass laser, CO2 laser and 488 nm Ar ion laser light.

The material, method, results and discussion of the research on the injury threshold of rabbit, monkey, and human being retina irradiated by argon laser light are introduced in this paper. When exposure time is 0.1s, the retinal injury threshold (ED50) is 0.506 W/cm2 for rabbit, 0.834W/cm2 for monkey, and 1.757 W/cm2 for human being. When exposure time is 1s, the retinal injury threshold is 0.428 W/cm2for rabbit.

This paper reports the experimental results about the retinal injury of animals arising from 488 nm laser irradiation. The ED50 of the retinal injury in rabbits and monkeys were obtained when the laser beam is parallel or passing through convergent lens. We also measured the facular diameter at cornea or retina with either beam.

The material,method and results of the research on the injury threshold of rabbits’ cornea caused by GW CO2 laser light are introduced in this paper. The dose for causing BD50 varies with the time of exposure: they are 3.62W/cm2 and 4.01W/cm2 for 1s and 125ms irradiation respectively.

The material, method and results of the research on the injury threshold of grey rabbits’ retina caused by Q-switched and frequency doubled Nd3+:YAG laser light are introduced in this paper. When exposure time is 8 ns, ED50 is 232.05J/cm2 (precornea).

One hundred chinchilla rabbit eyes were exposed to CW Nd3+:YAG laser light. Using Ophthalmoscopie criteria for retinal injury, the intraocular injury points (ED50) were 2.52 W/cm2 and 5.42 W/cm2 for exposure time of 1.02 s and 0.12 s, respectively.

The threshold of human retina by 150s pulsed YAG laser beam irradiation is reported in this paper. Pathological phenomenons of injured retina were observed directly usingthe optical microscope and the electronic microscope.

When the eyes of chinchilla rabbits and rhesus monkeys were exposed to laser pulse of the wavelength of 0.53m, the ED50 value thus obtained were 39.2 u J/cm2 and 187 uj/ cm2 for intraocular energy density respectively. The experimental results showed that monkey fundus is considerably less sensitive than the rabbit fundus.

Threshold of observable retinal injury was determined for chinchilla rabbits exposed to long pulse ruby laser light irradiation. The threshold, ED50 was 14.9mJ/cm2 and its 95% confidence limit was 13.6-~16.5mJ/cm2 for intraocular energy density.

In this experiment, gray chinchilla rabbits were exposed to He-Ne laser light with 6 and 5 different dosages respectively. The exposure time was 1 second and 1/8 second. 30 points were exposed for every dosage. ED50, the probability of injury to the retina at a rate of 60%, was obtained.

This paper deals with laser injury threshold for Chinese yellow skin by exposure to 1s CW Nd:YAG laser beam. The results of the experiment are:MRD equals to 71.37 W/cm3, and its 95% confidence limit is 67.47~75.49W/cm2.

This paper studies laser injury thresholds of 300s pulsed neodymium glass laser. The experimental results are: MED equals to 20.27 J/cm3, and its 95% confidence limit is 19.49~21.08J/cm2.

This paper reports the experimental results of pig skin exposed to ruby laser light. By statistical analysis of the erythema produced within 24 hours post-exposures, ED60 about 53.3 J/cm2 was obtained. The microscopic and scanning electron microscopic examinations showed nothing but the blood vessels dilation of derma after a near threshold-dose irradiation on skin.

This paper reports the pathological changes of retina! injury arising from argon laser irradiation with various laser densities and exposure time, and the characteristics of retinal biological effect arising from the irradiation.

The experimental method and the results are described in this paper. The injury thresholds of chinchilla retina by CW and pulsed YAG laser (1.06m) has been determined. The injury of retina for monkeys have also been studied using 150s pulsed YAG laser beams.

This paper reports the experimental results about the retinal injury of animals by 694.3nm irradiation. The ED50 of retinal injury was obtained. The pathological charaoteriatics of retina was observed and experimental techniques are presented.

This paper discribes the microscopic visual method with micrometer for facular diameter measurement of retina and cornea. Its characteristics are simple, rapid, accurate and harmless to eyes. It has much meaning on the basic research and clinical treatment.

The measurement of transmissivity of 488nm argon laser light through refractive system of the rabbit’s eyes in vitro is reported in this paper.