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Augenheilkunde und Low Level Laser

Ophthalmic Effects of Low-Energy Laser Irradiation

Belkin M, Schwartz M.

Surv Ophthalmol. 1994 Sep-Oct;39(2):113-22

Laser irradiation at subthreshold energies exerts various effects on the eye and other parts of the body, mainly the skin and nervous system, through a mechanism that has yet to be adequately explained. The ocular bioeffects are manifested mostly in the retina, but also in other ocular tissues. This review outlines the reported effects of low-energy laser irradiation on nonophthalmological tissues and organs, including those of the nervous system, with special emphasis on the optic nerve. It also details the ophthalmic phenomena induced by low-energy laser irradiation and examines claims of its therapeutic efficacy in several eye diseases, such as keratitis, glaucoma and macular degeneration.s exerts vatious effects on the eye and other parts of the body, mainly the skin and bioeffects.

 

Argon and low energy, pulsed Nd:YAG laser trabeculoplasty. A prospective, comparative clinical and morphological study.

Hollo G.

Acta Ophthalmol Scand. 1996 Apr;74(2):126-31.

Argon laser trabeculoplasty (ALT; 1.0 W, 0.1 sec, 50 microns) was performed in right eyes, and low energy, Q-switched Nd:YAG laser trabeculoplasty (Nd:YAGLT; 1.1-4.8 mJ/pulse) in left eyes of 14 patients with primary open-angle glaucoma and in one patient with juvenile glaucoma. The pre-laser intraocular pressure (IOP) was medically uncontrollable (IOP > 21 mmHg). The interocular pressure difference varied between 0 and 3 mmHg. In 9 patients IOP decreased to less than 22 mmHg (success) in both eyes. No statistically significant difference has been revealed with paired t-test in the degree of IOP decrease between ALT and Nd:YAGLT treated eyes during the 1-18 months' follow-up. Treatment variables of Nd:YAGLT had no statistically significant effect on the duration of the post-laser success with Cox-regression. In 4 patients both treatments were ineffective (IOP > 21 mmHg). In 2 patients ALT was successful but Nd:YAGLT was ineffective. In three cases of early bilateral laser failure (IOP > 21 mmHg at the first month visit) trabeculectomy was performed on both eyes in the third post-laser month. Following ALT the uveoscleral meshwork was severely destroyed in the area of the laser spots, and the surrounding collagen fibres were heat-damaged. The meshwork between the laser spots was covered by a membrane formed by migrating endothelial cells. In the uveoscleral meshwork Nd:YAGLT induced severe focal damage surrounded by circumscript shrinkage and scarring. The juxtacanalicular tissue remained free of laser induced damage. No endothelial membrane was present. The results suggest that low energy, Q-switched Nd:YAGLT may represent an alternative method of glaucoma laser surgery.

 

The comparative anaylis of using lowpower laser radiation, megnetic therapy and electrical stimulation in stabilization of visual functions in primary open-angle glaucoma.

Listopadove N A et al.

127 men with primary open-angle glaucoma (POAG) were treated with either L/LT, megnetic therapy or electrical stimulation. The examination included visus, visocontrastometry and automatic static perimetry. The field of sight at an initial stage of POAG was 56% of laser, 52 for megnetic therapy and 27 for electrical stimulation. In the advanced stage the figures were 39, 37 and 18, respectively.

 

Dose and temporal parameters in delaying injured optic nerve degeneration by low-energy laser irradiation.

Rosner M, Caplan M, Cohen S, Duvdevani R, Solomon A, Assia E, Belkin M, Schwartz M.

Lasers Surg Med. 1993;13(6):611-7.

Low-energy laser irradiation has been reported to postpone the degenerative processes in crushed optic nerves of rats, which are part of the nonregenerable mammalian central nervous system. In the present study, we evaluated the optimal irradiation parameters for this purpose. Optic nerves of 141 rats were subjected to crush injury and then irradiated through the eye, starting at different points of time before or after the injury, for different durations and periods, using various intensities of either helium-neon laser or noncoherent infrared light (904 nm). The effect was evaluated by measurements of the compound action potentials of the nerve segments between the site of injury and the optic chiasm. The compound action potential amplitude of the crushed nonirradiated nerves, as measured 2 weeks after the injury, was found to be 0.51 +/- 0.30 mV, in contrast to 3.10 +/- 1.03 mV measured in 232 normal nerves. Irradiation with a 10.5 mW helium-neon laser for 2 and 3 min once a day for 14 consecutive days resulted in maximal preservation of action potentials (1.78 +/- 0.72 and 1.95 +/- 0.71 mV, respectively). Irradiations beginning immediately prior to the injury were as effective as irradiations beginning soon after it. Irradiations for longer than 3 min or twice a day aggravated the damage. Noncoherent infrared light was ineffective or adversely affected the injured nerves. Our experiments suggest that optimal delay of posttraumatic optic nerve degeneration in rats is attainable with 10.5 mW helium-neon laser irradiations for 2 or 3 min once a day for 14 consecutive days.

 

Effects of low-energy He-Ne laser irradiation on posttraumatic degeneration of adult rabbit optic nerve.

Schwartz M, Doron A, Erlich M, Lavie V, Benbasat S, Belkin M, Rochkind S.

Lasers Surg Med. 1987;7(1):51-5

Axons of the mammalian peripheral and central nervous systems degenerate after nerve injury. We have recently found that He-Ne laser irradiation may prevent some of the consequences of the injury in peripheral nerves of mammals. In the present study, the efficacy of the laser in treating injured neurons of the mammalian CNS was tested. Optic nerves of adult rabbits were exposed daily for 8-14 days to He-Ne laser irradiation (14 min, 15 mW) through the overlying muscles and skin. As a result of this treatment, the injured nerves maintained their histological integrity, which is invariably lost in injured mammalian CNS neurons.

 

The mechanism of action of laser stimulation of the eye

Shmyreva VF, Pankov OP, KotliarskiÄ­ AM.

Oftalmol Zh. 1989;(4):213-6.

The mechanism of action of helium-neon laser stimulation has been studied in 26 eyes of 15 patients with dystrophic diseases of the eye and on the ground of 63 lymphangiographic investigations of the same patients. It was found that low-energy helium-neon laser stimulation (0.05-0.5 mWt/cm2) has a positive effect on restoration of visual functions. Lymphangiographic investigations have revealed a new biological phenomenon--activation of disturbed lymphatic flow under the action of a specially organized laser radiation. The results obtained confirm the earlier hypothesis (M. M. Krasnov et al., 1982) that under the action of laser radiation a normal physiologic system purifying the retina from disintegrated products is engaged into action.

 

Optic nerve regeneration--new aspects.

Solomon A, Belkin M, Harel A, Rosner M, Benbasat S, Lavie V, Erlich M, Schwartz M.

Metab Pediatr Syst Ophthalmol. 1988;11(1-2):31-2.

Injury to the optic nerve and its environment provokes a process of degeneration that leads to a degenerative process resulting in an irreversible loss of visual function. We succeeded in stimulating regeneration in injured optic nerves of adult rabbits. The stimulus to regeneration was achieved by implanting in injured optic nerves of adult rabbits substances originating from growing (regenerating) optic nerves of fish or developing optic nerves of neonatal rabbits, and by delaying the degenerative process by irradiating the injured optic nerve with a low energy laser. The effect was manifested by abundant growth of new fibers across the injury site and by other manifestation of regeneration characteristics.

 

The treatment of posttraumatic uveitis with low-intensity laser Radiation

Vin'kova GA, Ionin AP, Ionina GI.

Vestn Oftalmol. 1999 Sep-Oct;115(5):20-1.

Eighty-two patients with severe posttraumatic uveitis which could not be treated by traditional antiinflammatory therapy were exposed to low-intensity laser (LIL). The patients were divided into 3 groups: 1) infrared laser exposure using UleÄ­ 2K semiconductor pulsed laser, 2) intravenous exposure of the blood to a He-Ne laser LG-75, and 3) both treatments. The treatment efficacy was monitored by measuring lipid peroxides and superoxide dismutase in the lacrimal fluid. The treatment proved to be effective. The best results were attained by applying both methods of exposure, as was shown by sooner normalization of the content of lipid peroxidation products and activity of superoxide dismutase.

 

 

Mitochondriopathie

Mitochondriale Erkrankungen: Biochemisch-molekularbiologische Diagnostik von Defekten der Atmungskette
Gerbitz, Klaus-Dieter; Jaksch-Angerer, Michaela; Hofmann, Sabine; Bauer, Matthias Friedrich; Gempel, Klaus; Obermaier-Kusser, Bert; Paetzke, Ingrid
Dtsch Arztebl 1999; 96(46): A-2972 / B-2518 / C-2353
http://www.aerzteblatt.de/v4/archiv/artikel.asp?src=suche&id=20032

 

 

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