Rx convert to computer rx

[gogetter]

+1.25sph
+1.75-075x65
add 2.25

what rx would i use for Computer only? is there a common formula used?

thanks all!

[braheem24]

Use 50% of the add power and add it to the sphere.

ie

+2.37sph
+2.87-075x65

[gogetter]

so do i order it JUST like that or say mabe
+2.25sph
+2.75-0.75x65

what rx shoud i go with....i dont stock +2.37's..lol.

[drk]

A buck makes a great computer Rx.

[CME4SPECS]

so do i order it JUST like that or say mabe
+2.25sph
+2.75-0.75x65

what rx shoud i go with....i dont stock +2.37's..lol.

keep it on the weak side. By the way how far does this person sit from the screen? Standard 50% isn't always the best.

[HarryChiling]

A buck makes a great computer Rx.

Ditto +1.00 is a good ballpark.

[gogetter]

should i worry about the cyl on the left eye?

[CME4SPECS]

Yes, to do it properly.

[Uncle Fester]

+1.25sph
+1.75-075x65
add 2.25

what rx would i use for Computer only? is there a common formula used?

thanks all!

And in March you wanted to get info to help study for the ABO Advanced? This is really a basic, basic question that has some of us skeptical types wondering just who you are.

Seriously- go buy System for Ophthalmic Dispensing by Brooks Boorish. It answers this question under "Intermediate."

[HarryChiling]

Doing it properly requires a bit of measuring and knowledge.

Your Rx is:
+1.25 SPH
+1.75 -0.75 x 065
Add +2.25

Now lets say the current working distance for the Rx is 33cm that would be:

1/0.33 = +3.00

Now if you were to subtract the +2.25 Add from the working distance you would be left with the amount of accomadation the patient has left in this case:

+3.00 - +2.25 = +0.75

Now you could adjust your working distance for whatever the patient needs for the computer lets say it's 45cm thats:

1/0.45 = +2.22 or +2.25 (rounded)

now from this working distance you would subtract your accomadation:

+2.25 - +0.75 = +1.50

You could see how the working distance os needed to make a good pair accurate, but if you needed you could use the +1.00 and the patient who has the AR of +0.75 left can make up the difference of +0.50 with the +0.75 they have left in reserve. It does mean that they will more than likely experience asthenopia or need a new pair sooner.

[gogetter]

And in March you wanted to get info to help study for the ABO Advanced? This is really a basic, basic question that has some of us skeptical types wondering just who you are.

Seriously- go buy System for Ophthalmic Dispensing by Brooks Boorish. It answers this question under "Intermediate."

fester,

sorry we couldnt fit Jesus with his first pair of glasses like you did many moons ago. Im sure you've seen it all. Unfortunately ive been in the business for 5 years and have not come across all the situations that may be. And everyone , Im almost sure, would agree it doesnt take much to study for the ABO w a little hands on training and Pass. I recieved the ABO within my first 2 months of getting in the business. And yes i do want to study for the AV ABO and i am aware that its no cake walk. But just like you, im putting in my time and using YOU ALL for knowledge. Up to now ive had the luxury of Dr's writing multiple rx's for patients multiple needs. Now im kinda on my own at this new place and new Dr. So i will have many more questions in the future.

if you cannot shed any light on my questions then just dont reply! but i know you know your stuff so i would just appreciate your knowledgable answers and now what i should "Seriously" go study.

thanks for everyones help.

[jherman]

it from the add power and combine with the sphere power. If your left with less than than a .75 bi-focal power use a single vision lens.

hope this helps.

[Uncle Fester]

I'm sorry I got your dander up with my post. We do run into some malicious types who come on the board and poke fun at us before we realize we're being played:hammer:(not that you are).

I'm sorry that that my serious suggestion got you upset but it was my hope you would get this very helpful book on opticianry.

That you passed the ABO and are asking a question like this is an indictment on the ABO in my opinion.

I do wish you success in this wacky world of optics:)

Fester
PS Fitting Jesus was easy. He kept forgiving any error I made. Now St. Peter was another story:p

[gogetter]

Rx:+1.25sph
+1.75-0.75x155
add 2.25
working distance from PC 60cm
Pc height is eye level w pt.
patient currently in trifocals...if that matters.

WHAT RX SHOULD I USE FOR COMPUTER GLASSES?.....:hammer::cheers:

Sorry for the redundant questions.....im just having a hard time grasping this concept. I really so appreciate everyones help! Thanks again for all the help. I just want to make my patients happy:D

[HarryChiling]

Seriously- go buy System for Ophthalmic Dispensing by Brooks Boorish. It answers this question under "Intermediate."

gogetter,

That's the best advice given so far. :cheers: And with the working distance you provided and the assumed working distance for reading of 33cm from my example I would recommend a +1.00 addition to the distance. Good luck on your advanced you could pick my brain anytime.

[gogetter]

I'm sorry I got your dander up with my post. We do run into some malicious types who come on the board and poke fun at us before we realize we're being played:hammer:(not that you are).

I'm sorry that that my serious suggestion got you upset but it was my hope you would get this very helpful book on opticianry.

That you passed the ABO and are asking a question like this is an indictment on the ABO in my opinion.

I do wish you success in this wacky world of optics:)

Fester
PS Fitting Jesus was easy. He kept forgiving any error I made. Now St. Peter was another story:p

no prob....sorry for lashing out ...it was just one of those days...needless to say im still having trouble....but ill figure it out...hey ur luck i dont think this lady is as forgiving!:cheers: thanks!

[coronadoeyes]

there is a WAY easier way that ALL ODs are show in schooling... Opticians should have been shown this too... I WAS.
You start by calculating the reading RX
HOW YOU DO THAT haha at the top to the bottom
+1.25 +2.25 = +3.50
+1.75-.75X65 +2.25 = +4.00-.75X65

You then subtract .75 to the reading rx to bring it out farther.. there is a 1/4 for each ft.

The Computer RX = +2.75
+3.25-.75X65

[RustyS]

A lot of times people will be doing data entry from hard copy so NV is great to have IMO.

I agree Essentials for Opthalmic dispensing should be in every office. I find the ABO a joke also too much pathology not enough geometry.

[HarryChiling]

there is a WAY easier way that ALL ODs are show in schooling... Opticians should have been shown this too... I WAS.
You start by calculating the reading RX
HOW YOU DO THAT haha at the top to the bottom
+1.25 +2.25 = +3.50
+1.75-.75X65 +2.25 = +4.00-.75X65

You then subtract .75 to the reading rx to bring it out farther.. there is a 1/4 for each ft.

The Computer RX = +2.75
+3.25-.75X65

That does look a whole lot easier, the reason for me doing it the way I do and documenting the calculation on the back of the workup is because technically we are not allowed to change an Rx, but we are allowed to change it for working distance and vertex changes. If you seperate out the Accomadative Reserve from the Add you are left with pure optics and as such could argue that you didn't change anything about the Rx, technically you followed the Rx(recipe) you just changed the size of the batch. ;)

[Laurie]

Hello,

Have you considered:

Instead of re-working the Rx for Intermediate/Near, why not choose a lens that is designed for the computer? For example, the Office Lens by Shamir gives excellent Intermediate vision, and also brings the focus out to 10 - 13 feet, which a re-worked Intermediate/Near lens will not.

Also, a re-worked Intermediate/Near lens (if you use a PAL) will not yield as much Intermediate width as a lens like the Office will.

You simply order it like a PAL...giving the lab the distance Rx and Add power, with monocular distance and near PD's, and monocular fitting cross heights..they will do the rest!

: )

Laurie

[drk]

I think your brain is freezing on the math part.

Do this cookbook recipe:

A1. Take distance prescription
A2. Add +1.00 to sphere OU. This is the new distance power.

B1. Take add power
B2. Subtract +1.00 from add. This is the new add power.

Conceptualize it as "stealing +1.00 from the bifocal and moving it into the distance portion". Stealing is fun.

Use this procedure for any computer situation, pretty much. (Hey, you gotta bake cookies before you bake souffle!) :cheers:

[HarryChiling]

mmmmmmmmmmmmmmmmm cookies and souffle. :cheers:

[RustyS]

I dont like progressive types for computer specific glasses unless pt is really concerned with looking like a presbyope.

[HarryChiling]

I find the ABO a joke also too much pathology not enough geometry.

Really, pathology? You must have taken a different version than me.

[RustyS]

for brevity i used the term pathology which was incorrect. I should have used terminology instead. emmetropia esophoria etc.... I havent taken the ABO in over a decade but from what i remember there was little in regards to practical application and a ton of stuff i would not use unless wanting to dazzle a pt or potential employer with my optical vocabulary. I would like to see a practical application side of test. like neutralization, determing pd without pupillometer. panto and retro tilt. power through the 180, prentice rule, calculating intermediate add, alignment, and box measurements. I dont remember this stuff on the ABO i took and complained to my friend i studied all the wrong stuff. I still passed with an 86 in 45 minutes. I was in a hurry and wanted to get out of there.