Prism Segment Lens?

**Alex Camblor** · 07-13-2021, 05:27 PM

Have a patient with the following RX, that we fitted for FT28:

OD: +0.25-0.50x160 4.50BO 4.00BU
OS: +0.50 sph 4.50BO 4.00 BD
+2.25 Add

He can see fine through the distance but he still experiences double vision while reading.
The doctor rechecked prism at the near and got OD: 1.25 BO 1.50 BU OS: 1.00 BO 1.25 BD
He is suggesting either Prism Segment lens or Franklin Bifocal, but I have never dispensed either.

Does anyone have any tips or suggestions for this RX? Also, any suggestions on labs that can do prism segments or franklins? I have only found Slabsplus or Epic Labs through my googling.

**Lensman11** · 07-13-2021, 11:44 PM

I think the Doc should recheck his findings. It does not seem possible for the prism to be that much different in the reading portion.

**Uncle Fester** · 07-14-2021, 10:37 AM

What was the previous rx?

First time bifocals?

Is the double vision vertical or horizontal?

**Robert Martellaro** · 07-14-2021, 11:29 AM

Alex,

Epic has never let me down, but it has been about two years since they have done work for me (through Walman).

Does it have to be a multifocal, maybe for occupational reasons? If not, consider multifocals for distance, closing one eye to see a mobile phone, glancing at other near objects, etc., then supply SVNO for reading. Or two pair of multifocals, one pair optimized prism-wise for near, the other for distance, or SVDO and SVNO.

Hope this helps,

Robert Martellaro