Bifocal to a Computer pair

[nawsman]

What is the formula to change a Bifocal (Flat Top) into a single vision computer.

I would appreciate any information regarding this, thanks you

[WFruit]

The general rule is to add half of the add power to the distance Rx.

HOWEVER:

The best thing to do is call the Doctor and ask. It can vary depending on distance from the monitor/keyboard and viewing angle to the monitor/keyboard.


Despite my first reaction, I have elected NOT to turn you into a crispy piece of toast for not knowing this.

[nawsman]

I apologize for my ignorance. This is the first time this has came up int the four year working as an optician and my Doc has gone on vacation..lucky him.

[cocoisland58]

Don't feel too bad about it nawsman, the first time I had to do it (though I thought I knew how) I scratched my head for quite a while. I've done two this week so it's good you now know how.

[Sam Pelican]

Of course another option is a computer lens. Most manufacturers have models. I have used a lot of the Shamir Office. You measure just like a progressive and the lab will compute the power. They cost a bit more than single vision but a lot less than a progressive lens. Between them and polaroid sunlenses I get the most positive feedback of anything I sell. Call your lab and have them explain how they function so you can explain it to the patient.

[John@OWDC]

You can find step-by-step instructions and a 15 question practice test at www.opticianworks.com.

Let me know if you have any questions.

john

[chip anderson]

Note: Don't forget that when you put 1/2 the add in the top, you need to reduce the add at the bottom by the same amount, giving you the resultant add of the origional Rx. In other words if you add 1.25 to the top for the computer, reduce the add to 1.25 also.

Chip

[wrg_ldo]

This is the best option of all. Another lens I have had great success with is the Hoya Tact. The entire middle third of the lens is set for the computer; it has an extra-large reading zone, and maybe best of all there is a small area at the very top that allows the wearer to navigate the workplace without removing the glasses. SV computer lenses are a disaster, and most wearers end up hating them.

[cocoisland58]

Note: Don't forget that when you put 1/2 the add in the top, you need to reduce the add at the bottom by the same amount, Chip

That's what had me stumped at first.

[uncut]

What is the formula to change a Bifocal (Flat Top) into a single vision computer.

I would appreciate any information regarding this, thanks you

I am not sure this formula exists! :bbg:

[chip anderson]

If you want a sv for computer just add +1.25 to distance Rx. Assumes pt has an add of at least 2.00. If he doesn't have this much add he probably doesn't need "computer glasses" yet. Pt. will not be able to see either printed page on desk or distance well but computer screen should be just fine.

Chip

[normuck]

I start by taking 1/2 the add power and adding this to the distance rx, this is really pretty close. But I always trial frame the rx when this comes up, then I use the +/- 0.25 and 0.50 flippers to help the patient get the most comfortable computer focus :). Good Luck

[Yeap]

an office or computer lens should be a better option. most manufacturer have this.. shamir office, hoya tact/addpower, nikon Web as well as zeiss. just pick the one that you prefer.. we using more on hoya and shamir for this lens. so far all the wearer is happy about it. a single vision will compromise if any reading task they need to do in between especially for those who have higher addition.