Alliedassault - View Single Post

SoLiDUS · 01-03-2003, 07:33 PM

Accomodation.

This has been attributed to glare from overhead lights, glare from the screen, poor contrast, reflections, poor lighting, squinting, infrequent blinking resulting in dry eyes, focusing close for long periods of time, ultraviolet light or "radiation" from the screen, inadequate screen resolution, etc. Also, letters on a computer screen consist of round pixels of light that form letters which are not sharply defined on the edges, different from the solid lines of normal print. This can create difficulty for the brain to accurately control focusing effort, resulting in blurred vision. The eye can tend to constantly shift its focus from the print to a point farther away and back again, causing fatigue. Various types of tinted glasses in various powers have been offered for sale to reduce the discomfort of computer work, but they often do not live up to their promises. Usually, the glasses seem to help for a while but then the old symptoms reappear.

It would seem that pinhole glasses offer as good a solution to this problem as it is possible to find, and at a much lower cost than other options. Glare from above or the sides is reduced by looking through the holes. The depth of field increases. Also, the focusing effort, or accommodation, is reduced, just as if you put on a weak pair of reading glasses. This also reduces the possibility of developing myopia from the constant close work, in those who are prone to do so. Ultraviolet, or other forms of radiation, have been shown to be of no consequence.

[url:a522a]http://www.myopia.org/pinholes.htm[/url:a522a]

They might look stupid but I can guarantee you: they work.

	(#8)
SoLiDUS is Offline Senior Member Posts: 5,158 Join Date: Jan 2002 Location: Gatineau, Qc, Canada	01-03-2003, 07:33 PM Accomodation. This has been attributed to glare from overhead lights, glare from the screen, poor contrast, reflections, poor lighting, squinting, infrequent blinking resulting in dry eyes, focusing close for long periods of time, ultraviolet light or "radiation" from the screen, inadequate screen resolution, etc. Also, letters on a computer screen consist of round pixels of light that form letters which are not sharply defined on the edges, different from the solid lines of normal print. This can create difficulty for the brain to accurately control focusing effort, resulting in blurred vision. The eye can tend to constantly shift its focus from the print to a point farther away and back again, causing fatigue. Various types of tinted glasses in various powers have been offered for sale to reduce the discomfort of computer work, but they often do not live up to their promises. Usually, the glasses seem to help for a while but then the old symptoms reappear. It would seem that pinhole glasses offer as good a solution to this problem as it is possible to find, and at a much lower cost than other options. Glare from above or the sides is reduced by looking through the holes. The depth of field increases. Also, the focusing effort, or accommodation, is reduced, just as if you put on a weak pair of reading glasses. This also reduces the possibility of developing myopia from the constant close work, in those who are prone to do so. Ultraviolet, or other forms of radiation, have been shown to be of no consequence. [url:a522a]http://www.myopia.org/pinholes.htm[/url:a522a] They might look stupid but I can guarantee you: they work.