Apr
I went to store called Costco in san diego. they had a section for computer glasses. what's the difference? the clerks who work there don't know the difference. thanks
Answer:
Your question has to do with the concept of working distance. Reading tends to occur at a closer distance than the location of a personal screen. The stronger the power of a lens, the closer the lens focuses to the face. Therefore, a reading lens should have a slightly stronger prescription than a computer lens. But all that means is that you could select a “computer glass” from this section that’s higher in power and it would work quite well as a reading lens.
As to uv protection. It is my opinion that ALL spectacle lenses should have uv protection independent of their purpose.
I do believe that many times placing an antireflective coating on a lens can improve visual function when using a computer, BUT, I would be VERY surprised if a section of premade “computer glasses” at Costco had antireflective coating. This is an pricey treatment and not one that a cost cutting operation would likely use.
So, having said all this, it is my opinion that this section of computer glasses is simply a marketing tool to motivate a person to purchase an extra pair of glasses.
Answer:
Here’s your answer
Sit at your computer desk and bring up your e-mail as you do every day.
Now DO NOT MOVE your head but place the end of a tape measure at the bridge of your nose (right between the eyes) and the other end touching the personal screen.
It might be 20″ or even 22″ but whatever you measure is YOUR computer distance. OK
Now do the same thjng when you’re reading a book and you will usually find it to be 16″ to 18″.
In other words COSTCO is saying that personal glasses have a range about 6 inches further away (or even more if your computer monitor is placed further back on your desk).
Another way of putting it if your reading glasses for example are
plus +2.00 then your computer glasses should be about .50 less or a +plus1.50
These are only guesses since it depends of how far back you sit doing the different tasks, and even the height of the person. A 6'3″ person has a much different reading distance than a small 5'2″ lady.
The only sure was would be to do those measurements as above and then AT THE STORE try on different powers for ideal reading on the store's desk or wall where there is book size print.
Answer:
Ultra violet rays from the screen of the computer make the eyes exhausted, red, watery, irritated, itchy at the end of the work.Personal glasses are made UV protectant by using special material and coating.For awareness of the customers, a separate section.