Quicktopic posts: Oct 2003
Moderators: Anne Klepacz, John Smith, Sweet
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meg
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Rob Armstrong
Re: 100Hz TVs and computer monitors.
As Andrew mentioned, 100Hz TVs appear to flicker much less than older (50Hz) models, and are easier on the eyes.
When it comes to computer screens, the refresh rate of a traditional CRT monitor can be at various settings, depending on what your particular monitor (and computer) supports. Basically the higher the better. The lower your screen resolution, the higher the available refresh rates. Its a trade-off between the two. Try different options in your Displays Control Panel to find the best setting for you.
But flat screen monitors work differently. With a TFT monitor, your computer can actually control each individual pixel, only changing them as and when needed. So there is no refresh rate-totally flicker free! These screens really are better on the eyes.
IMPORTANT NOTE: The above only applies if your flat screen monitor and computer supports a digital connection. You want to look out for one with a DVI socket. Some (usually cheaper) flat screen monitors only come with a conventional VGA socket, which will refresh (and flicker) in the same way as your bulky old CRT monitor. Don't get caught out!
Hope that clears the issue up a bit. If I didn't explain it that well (I tried to keep it brief), don't hesitate to ask any questions.
Rob.
As Andrew mentioned, 100Hz TVs appear to flicker much less than older (50Hz) models, and are easier on the eyes.
When it comes to computer screens, the refresh rate of a traditional CRT monitor can be at various settings, depending on what your particular monitor (and computer) supports. Basically the higher the better. The lower your screen resolution, the higher the available refresh rates. Its a trade-off between the two. Try different options in your Displays Control Panel to find the best setting for you.
But flat screen monitors work differently. With a TFT monitor, your computer can actually control each individual pixel, only changing them as and when needed. So there is no refresh rate-totally flicker free! These screens really are better on the eyes.
IMPORTANT NOTE: The above only applies if your flat screen monitor and computer supports a digital connection. You want to look out for one with a DVI socket. Some (usually cheaper) flat screen monitors only come with a conventional VGA socket, which will refresh (and flicker) in the same way as your bulky old CRT monitor. Don't get caught out!
Hope that clears the issue up a bit. If I didn't explain it that well (I tried to keep it brief), don't hesitate to ask any questions.
Rob.
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Rob Armstrong
I think the guide showing how our vision is affected by KC is an excellent idea. Not only to help explain to friends and family, it would also be informative for employers and educational institutions. It would no doubt improve understanding even among medical professionals and, in more advanced cases, would simplify things for anybody in the process of applying for benefits due to their poor vision. (Describing your vision in the "additional notes" box is not as simple as it first seems).
I'm all for it!
Rob.
I'm all for it!
Rob.
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Brian Taylor
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eamonn
Hi All,
i thought i would inform you all about my PGCE in teaching secondary ICT. At the moment everything is fine. No bad eye days for a few months. My secret is to only wear my contacts when i need them besides that i wear my glasses. Wearing my glasses means that everything is out of focus. But when i put my contacts in my eyes can home in on everything - colours, peoples faces, trees, grass, blue sky. Sometimes when i put my contacts in i feel like a new born child who sees the world for the first time - i feel alot of love in my heart.
Got into a bit of hot water with my faculty for not telling them about my eye condition. There was a big meeting with all the big heads..i could not but feel like a criminal. What is the legislation about applying for employment...do we tell them that we have KC with the risk that we get shot down straight away or do we be honest and hope that they act in a decent manner.
thanx for listening
eamonn
i thought i would inform you all about my PGCE in teaching secondary ICT. At the moment everything is fine. No bad eye days for a few months. My secret is to only wear my contacts when i need them besides that i wear my glasses. Wearing my glasses means that everything is out of focus. But when i put my contacts in my eyes can home in on everything - colours, peoples faces, trees, grass, blue sky. Sometimes when i put my contacts in i feel like a new born child who sees the world for the first time - i feel alot of love in my heart.
Got into a bit of hot water with my faculty for not telling them about my eye condition. There was a big meeting with all the big heads..i could not but feel like a criminal. What is the legislation about applying for employment...do we tell them that we have KC with the risk that we get shot down straight away or do we be honest and hope that they act in a decent manner.
thanx for listening
eamonn
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Freddy Bull
Dear all,
I am changing my email address due to an overload of spam. In future it will be frederica.bull@btinternet.com
Freddy Bull (Mrs)
Northants, UK
I am changing my email address due to an overload of spam. In future it will be frederica.bull@btinternet.com
Freddy Bull (Mrs)
Northants, UK
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John Smith
Re: 100Hz computer screens.
Rob's information is very accurate, but he didn't mention how to change the refresh rate. It's not always obvious(!), but this is how to do it on Windows 2000 or XP:
1. Right click on an unused bit of desktop (where there is no window or icon). Choose "Properties". A "Display Properties" window opens.
2. Click on the "Settings" tab.
3. If you want to change the screen resolution (number of pixels on the screen. Higher is often considered better, but will give you smaller text. Choose something you're comfortable with. Higher resolutions may limit the maximum refresh rate, depending on your graphics card/monitor)
4. Click on the "Advanced" button. A new window appears.
5. Click on the "Monitor" tab.
6. You can then choose the monitor refresh rate in Hertz (refreshes per second). Windows often defaults to the lowest refresh rate, so this is a great way of reducing flicker.
When you change the settings and click OK, Windows will ask you if you want to keep the new settings. If you can't see the screen properly after the change, don't worry; just sit back, and Windows will revert to the previous settings. If the new settings are OK, Click OK on the relevant button in the small window which will appear.
Hope this helps!
John
Rob's information is very accurate, but he didn't mention how to change the refresh rate. It's not always obvious(!), but this is how to do it on Windows 2000 or XP:
1. Right click on an unused bit of desktop (where there is no window or icon). Choose "Properties". A "Display Properties" window opens.
2. Click on the "Settings" tab.
3. If you want to change the screen resolution (number of pixels on the screen. Higher is often considered better, but will give you smaller text. Choose something you're comfortable with. Higher resolutions may limit the maximum refresh rate, depending on your graphics card/monitor)
4. Click on the "Advanced" button. A new window appears.
5. Click on the "Monitor" tab.
6. You can then choose the monitor refresh rate in Hertz (refreshes per second). Windows often defaults to the lowest refresh rate, so this is a great way of reducing flicker.
When you change the settings and click OK, Windows will ask you if you want to keep the new settings. If you can't see the screen properly after the change, don't worry; just sit back, and Windows will revert to the previous settings. If the new settings are OK, Click OK on the relevant button in the small window which will appear.
Hope this helps!
John
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John Smith
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John Smith
The Pimlico trial really is very interesting, and I really recommend going down to see Marine if you can.
The disortion of the letter chart on her monitor would be a "simple" effect of applying a function to an image (in this case, an image of a letter chart).
The hard bit is working out the function in the first place. I think the problem is that the machine is working out a personal function for each of us and, as has been said often before, we're all different!
Still, it's a great idea!
The disortion of the letter chart on her monitor would be a "simple" effect of applying a function to an image (in this case, an image of a letter chart).
The hard bit is working out the function in the first place. I think the problem is that the machine is working out a personal function for each of us and, as has been said often before, we're all different!
Still, it's a great idea!
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umbilica@umbilical.demon.
Andrew asked if one can get "rapid refresh" rate computer screens.
I don't know; but....
this problem (of 50 refreshes per second and flicker) only
relates to computer screens that are made of "cathode ray tubes". These days, you can also get computer screens made using
completely different types of technology. For example, many
laptop and "thin screen" screens now are made using "TFT" or
Thin Film Transistor technology. Because of the way these work, they don't need to be refreshed regularly in the same way as CRT screens, so the flicker problem doesn't arise.
You might like to try looking at a TFT screen. I have one on my laptop, and reckon it is better for me than the old CRT
monitors. It is also much smaller, doesn't hum and doesn't
produce so much heat. The downside was, it was also much more
expensive.... though computer kit does tend to get cheaper all
the time.
Rosemary
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Rosemary F. Johnson
I don't know; but....
this problem (of 50 refreshes per second and flicker) only
relates to computer screens that are made of "cathode ray tubes". These days, you can also get computer screens made using
completely different types of technology. For example, many
laptop and "thin screen" screens now are made using "TFT" or
Thin Film Transistor technology. Because of the way these work, they don't need to be refreshed regularly in the same way as CRT screens, so the flicker problem doesn't arise.
You might like to try looking at a TFT screen. I have one on my laptop, and reckon it is better for me than the old CRT
monitors. It is also much smaller, doesn't hum and doesn't
produce so much heat. The downside was, it was also much more
expensive.... though computer kit does tend to get cheaper all
the time.
Rosemary
--
Rosemary F. Johnson
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