type of refractive errors

[amitverma1]

Hi all, I need to know what what is the minimum power diff when rx can be considered anisometropic. for example, -1.00 and -1.25 DS OD and OS respectively I don't think it will be. -1.00 and -4.00 will be so where do you draw the line???

[vcom]

I don't know if there is a specific 'minimum', but I'd say 2 diopters and greater difference qualify, as long as both spherical powers are either myopic, or hyperopic. If the spherical powers are different signs, one myopic, the other hyperopic, then the condition qualifies as antimetropia.

There. I just met my smart talk quota for the day.

[amitverma1]

thanks vcom, thats what I thought but i didn't want to say it myself first. How about aniseikonia. I guess proabably same

[Robert Martellaro]

http://www.college-optometrists.org/...ctive_d5_5.pdf

[tmorse]

[QUOTE=amitverma1;490384]Hi all, I need to know what what is the minimum power diff when rx can be considered anisometropic. for example, -1.00 and -1.25 DS OD and OS respectively I don't think it will be. -1.00 and -4.00 will be so where do you draw the line???[/QUOTE

Many consider 2.00D power difference a starting point.
But Florida's 'Slabs Plus' advertises 0.5^ slaboff capability, and yet Reverse Slaboff lenses start at 1.5^.
Your regulatory Practice Standards list vertical imbalance tolerance at 0.5^
so that even a -1.00 and -2.00 can put you just over. If a patient walks in with a tilted frame front, this may be an indicator.
Let's hear from the OD and OMD's.

[amitverma1]

thanks tmorse, helped me visualize.