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- From: hank@netcom.com (Hank Roberts)
- Newsgroups: sci.med
- Subject: Re: Seasonal Affective Disorder - Light Treatments
- Message-ID: <1992Nov8.194753.14292@netcom.com>
- Date: 8 Nov 92 19:47:53 GMT
- Article-I.D.: netcom.1992Nov8.194753.14292
- References: <hank.720731904@well.sf.ca.us> <27739@castle.ed.ac.uk> <hank.720988194@well.sf.ca.us> <27842@castle.ed.ac.uk>
- Organization: Netcom - Online Communication Services (408 241-9760 guest)
- Lines: 61
-
- >>>3) For the treatment of SAD is it necessary for the eyes to be exposed
-
- >>Be careful. Being depressed is better than being blind and depressed,
- >>according to friends of mine who've been blind from birth and also have
- >>SAD. Don't put your eyesight at any risk.
-
- >Aha! So if one can be blind, and suffer from SAD, then it is clearly
- >not necessary to _look_ at the light! -- which makes it quite easy to
- >be safe.
- >--
- >Chris Malcolm cam@uk.ac.ed.aifh +44 (0)31 650 3085
- >Department of Artificial Intelligence, Edinburgh University
- >5 Forrest Hill, Edinburgh, EH1 2QL, UK DoD #205
-
- That does not logically follow.
-
- People who are blind do indeed sometimes have circadian rhythm problems
- [the human clock runs on a 25-hour cycle; daylight resets it each day]
-
- People who are blind are sometimes depressed
-
- Some blind people have benefited from chemicals that reset the body
- clock (melatonin) or that affect serotonin pathways related to this.
-
- I can't see anything in what I know here, from which you can draw
- the conclusion that it's not necessary to look at the light; and the
- literature _of_which_I_am_aware_ has not demonstrated any improvement
- in SAD from illuminating any other part of the body.
-
- See if these cites cast any light on the question:
-
- Opthalmic implicatoins of seasonal affective disorder
- Paramore, JE and King, VM
- J. Am. Optom. Assoc. Jul 1989 60 (7) p. 508-10
- "A review of sseasonal affective disorder (SAD) is presented with a
- discussion of its standard treatment of phototherapy. A number of opthalmic
- implications related to SAD are proposed. These implications relate both
- to the condition and the phototherapy used in its treatment, especially
- \the use of "full spectrum" light which contains ultraviolet and near
- ultraviolet radiation" [MEDLINE abstract; all I've seen -- HR]
-
- If you want a tan, despite the skin cancer warnings, that's your business.
- I just caution you not to try to treat SAD using sunlamps
-
- Bright Light Treatment: are we keeing our subjects in the dark?
- Dawson, D; Campbell, SS
- Institute for Circadian Psychology, Boston, MA
- Sleep Jun 1990 13 (3) P. 267-71
-
- "This study examined proximity and gaze behavior during illumination as a
- source of variation in response ...at best subjecte exposed to a
- transmitted illuminance of 10,000 lux perceived only 20% of the
- transmitted light, and this dropped rapidly to between 1 and 2% when
- subjects were more than 3 feet away and not gazing directly at the light
- source. These results suggest that light treatment protocols may be
- compromised
- by lack of attention to compliance and ... these issues may account for
- much of the response variance observed previously."
-
- I would be _very_ interested in cites to any successful phototherapy for
- depression for blind people, or without looking at the lights. Please post.
-