Sale of Incandescent Bulbs to End on Tuesday?

[james]

For sale: Wall mirror. Only looked in once. JF

[Steve Terry]

AFAIK it's the muscles around the eyes that get strained which lead to so called eyestrain headaches, etc

Steve Terry

[Jules]

It's what you get if you replace your incadescent car bulbs with energy-saving CFLs.

[Jules]

Interesting. We get some really harsh winters where I am (several ft of snow for several months each year) and even then the official recommendation is just to carry some snow chains in the vehicle "just in case". Snow tyres *are* good in the right conditions, if you have the space for them, but it is a faff swapping them for regular tyres and back when needed.

Maybe it's a big conspiracy to push fuel consumption figures up and hence raise extra revenue via tax for cash-strapped governments. :-)

[james]

In message , Steve Terry writes

The muscles which control the eyes' accommodation won't have to do anything unless the objective's distance varies, and the iris muscles that control aperture don't do much unless the ambient light levels change. And even if those muscles do have to work, they hardly use enough energy to challenge their supply of oxygen.

The brain may get tired by an increased level of concentration but there is no such thing as 'eye strain'. A camera's lens cap is not provided to protect it from allowing too many images to pass through it.

[Mark]

In spain glasses wearers have to carry an infinite number of spare specs.

[Derek Geldard]

An opening for a Specsavers advert if ever I saw one.

Derek

[Steve Walker]

I always wondered what would happen to me if I was stopped in Spain, as although I always wear my glasses when driving (preferring to see things clearly earlier rather than later!), my vision is above the minimum required without them, therefore there seems little point in having a spare set that needs replacing every time my prescription changes.

SteveW

[dennis]

But not for optical express! I just got my spare pair of specs out of the case they have been in for two years and they have snapped at the bridge even though they have not been used for two years. I will be having words with them as they were the flexible ones so that they wouldn't break and they didn't say they self destruct.

[Francis Burton]

[Willy Eckerslyke]

Some are. Ok, were.

[Francis Burton]

So you are effectively saying that eyestrain is in the eye of the beholder?

Francis

[John Rumm]

To an extent, this sounds like a semantic argument... much as a physicist would argue that centrifugal force does not exist, we all still know what is meant when the phrase is used.

Eye strain as a phrase may not directly correlate to a single physiological process, but it will describe a gamut of vision associated effects that result in fatigue or headache etc.

As someone long sighted can probably attest - in the early stages and mild symptoms, one can usually see to perform close work adequately well without glasses, however doing so for any period of will result in a headache as in this case the eye is forced to work much harder to gain sufficient refraction through the lens to bring an image to focus on the retina and not behind it. Older people may experience "eye strain" in situations with rapidly changing illumination levels as their eyes have lost some of their adaptation speed.

I think you just shot down your own argument. If one feels that fatigue as a result of reading in poor light etc, then to intents they are feeling "eye strain" - Even if in this case it may have nothing to do with the eye.

An autofocus camera in low light levels will have to work its AF system much harder as the lack of contrast forces it to continuously to "hunt" for best focus. Drains the batteries faster as well! Lens strain perhaps ;-)

[Martyn H]

looking at the automotive sector will produce more than a few examples with increasing numbers of vehicles being fitted with LED lamps for all but (main beam) headlights ...

also the emergency services equipment world with more and more of the lighting in convewrsion both 'room' lighting and warning lighting being LED

[Fevric J. Glandules]

[flying with kids]

Same at Gatwick & Stansted. Probably the same at any decent sized airport.

Any big airports?

Yes, the UK's child protection laws are *so* much more fussy about stuff like that. But by god it makes them easier to handle.

[Grimly Curmudgeon]

We were somewhere around Barstow, on the edge of the desert, when the drugs began to take hold. I remember AlanG saying something like:

information from Encarta, which is quite sprinkled with such nonsense.

[james]

In message , Grimly Curmudgeon writes

Some years ago on 'Newsnight' Jeremy Paxman did raise the issue of Encarta's many accuracy failings with the CEO of Microsoft UK. JP quoted the entry from the English language edition of an Indian Encarta which cited the work of a indian person who had done a considerable of research in telephony. Unfortunately there are no 2nd prizes in the invention stakes. At the end of the article was a grudging admission that Bell had been first past the post.

The Microsoft Suit's reply was astonishing. He said that the information in Encarta sought to be useful rather than dotting the 'i's accurate. The Italian edition cited the work of an Italian physicist at length and so on.

His reply wins my chutzpa prize.

[geoff]

In message , "dennis@home" writes

Were they left in your car and subject to the tremendous forces they undergo as you accelerate from zero up to 29mph ?

Go on, give them a damned good talking to

I presume that you paid over the odds for them ...

[geoff]

Fevric Jr & Fevrica ?

[dennis]

Yes! Even to more than that at times.

Why not, I just got a refund on a faulty dishwasher and I still have the dishwasher if I can fix it.

Depends on if you think you can get hi index varifocals that work by buying over the net,