Valerio Ricciardi ROMA Lazio
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18.10.2011



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Scambio: ANCORA LASER FUORILEGGE (1 mw x 6 km...???) SU ASTROSELL

Post su Astronomy in: Altro il 25 Giugno 2018




CHIUSO Fascio verde, ben 6 km di traccia in cielo, ...dichiarati 1 mw di potenza (con la quale si può produrre un puntino rosso su uno schermo durante una conferenza per evidenziare dei Powerpoint, o farlo "correre per terra" per divertirsi a vedere il gatto che lo insegue).

AVVISO DEL SOTTOSCRITTO: Coloro che insistono a trovare canali per comprare a prezzo stracciato questi oggetti PERICOLOSI che NON sono in libera vendita - quando di potenza significativa - salvo poi riproporli lucrandoci su mercatini come Astrosell, cancellino ORA i loro annunci e si concentrino sulla compravendita di altro, camere CCD, spianatori di focale, mandorle tostate, foderine per auto, lenti di Barlow, croccantini per cani, catene da neve, monopattini.
Ci sono state anche molte segnalazioni di parabrezza di aerei presi di mira in finale di atterraggio, in un paio di casi uno dei due piloti è stato incapacitato dall'abbagliamento.
Sono oggetti la cui vendita è libera quando di Classe I e II, fra 1 e 5 mw, ma con 1-5 mw non si produce un fascio in cielo di 6 km.
Queste restrizioni servono non a impedire che in uno star party possano essere utilizzati per mostrare costellazioni, ma che finiscano in mano con troppa leggerezza a persone inconsapevoli che poi se li ritrovano a girare per casa. - - - - - -

Da Il Messaggero ed. online di oggi:

PUNTATORE LASER GLI BUCA LA RETINA, VISTA COMPROMESSA PER IL BIMBO DI 9 ANNI

(...) Un bimbo di nove anni, che vive a Larissa, in Grecia, ha riportato un grave danno alla retina dopo essersi esposto al fascio di luce di un puntatore laser DI COLORE VERDE. (...) ha colpito infatti la macula, la zona centrale della retina più sensibile alla luce e ai colori a causa dell'alta densità di fotorecettori. I danni che possono causare i laser sono noti da tempo, ma evidentemente ci sono ancora ragazzini e genitori che sottovalutano il problema. (...) il bimbo ha riportato un vero e proprio buco all'interno della retina. «Il danno è grave, (...) I laser riscaldano i tessuti della retina fino a bruciarli, ed è proprio ciò che è successo», affermano i medici che hanno analizzato il caso. - - - - - - - -

TIME? Eccovi serviti, testo originale -

A LASER POINTER BURNED A HOLE IN A 9-YEARS OLD BOY'S EYE, DOCTORS SAY -

By JAMIE DUCHARME June 22, 2018 -

Playing with a laser pointer may have left a young boy with permanent eye damage, according to a case study.

A 9-year-old boy visited an ophthalmology clinic in Larissa, Greece, complaining of vision problems in his left eye, the case study published in the New England Journal of Medicine says. Despite having 20/20 vision in his right eye, doctors found that his left eyesight was around 20/100 — a discrepancy explained by a hole on his left macula, a part of the retina that “provides sharp, central vision,” according to the National Eye Institute. Macular holes can cause blurry and distorted vision, and typically happen through eye trauma or as part of the natural aging process.

After interviewing the patient, doctors determined that his eye damage was likely caused by playing with and staring at the light of a green laser pointer. Given the extent of the damage, the boy’s doctors opted not to operate, and said his vision has not improved during 18 months of follow-up.

“Macular hole, in general, is usually repairable, but it doesn’t usually happen from laser pointers,” explains Dr. John Miller, director of retinal imaging at Massachusetts Eye and Ear. (Miller was not involved in the case.) “The laser actually heats up the tissue…and almost burns or vaporizes the retinal tissue, so it’s lost, as opposed to in the more typical traumatic injury or in the older patient population.”

Miller says most patients who experience laser-related damage see less-severe — but still potentially permanent — injuries, typically affecting only the outer retina. Massachusetts Eye and Ear sees in the ballpark of three to five such cases per year, he estimates.

Lasers can cause eye damage in as little as a few seconds, and anything from the power and wave length of a laser to the angle at which it’s viewed can affect the severity of an injury, Miller says. But based on the extent of the Greek boy’s injuries, Miller guesses that his exposure was prolonged.

“Most likely, with the size of the hole, this was an extended period of exposure,” he says. “It would not be likely to happen with a very brief exposure, but it’s hard to know.”

To play it safe, Miller recommends keeping kids away from laser pointers, even if they seem harmless.

“A laser pointer, to many, would seem safe, but there are many out there that are not properly screened and they don’t have the proper warnings,” Miller says. “If you notice your child is playing with it, take it away or very carefully look at it to make sure [it’s safe]. There’s really no reason kids should be playing with laser pointers, basically.” - - - - - - - -

Report medico ORIGINALE sul prestigioso THE NEW ENGLAND JOURNAL OF MEDICINE:

MACULAR HOLE FROM A LASER POINTER

Sofia Androudi, M.D., Ph.D.,
and Eleni Papageorgiou, M.D., Ph.D.

A 9-year-old boy was brought by his parents to our ophthalmology clinic for evaluation of decreased vision in his left eye. Visual acuity in the left eye was 20/100, as compared with 20/20 in the right eye. Funduscopic examination of the left eye revealed a large macular hole with a hypopigmented atrophic area inferiorly (Panel A). Optical coherence tomography confirmed the full-thickness macular hole. Fundus autofluorescence imaging highlighted two spots inferior to the macular hole that corresponded to additional areas of injury (Panel B). The child reported playing with a green laser pointer and repeatedly gazing into the laser beam. Although many national health agencies have warned about the potential eye hazards associated with handheld laser pointers, and the sale of devices with greater than 1 mW of power is restricted in many areas, more powerful laser devices remain accessible, especially through the Internet. Because of the large diameter of the macular hole and the accompanying atrophy in this patient, we favored conservative management rather than surgery. The patient’s vision has remained unchanged during 18 months of follow-up.

Sofia Androudi, M.D., Ph.D.
University of Thessaly, Larissa, Greece

25 Giugno 2018
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