OT: Anyone use Double-D Bifocal lenses? - Saab General Bulletin Board - Saabnet.com
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OT: Anyone use Double-D Bifocal lenses?
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Posted by MI-Roger [Email] (#882) [Profile/Gallery] (more from MI-Roger) on Sun, 30 Nov 2014 15:14:34 Share Post by Email
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Keep it clean boys, this is a serious question.

Double-D Bifocals have the distance vision prescription occupy the large central part of the lens with two D-shaped near/reading prescriptions located at both the standard lower position AND at the top of the lens. Hence, the Double-D name.

Three times in the past 8 months, while working on my cars and spending considerable time on my back trying to focus on items close to my face, I have been overcome with sudden bouts of nausea. I suspect it is caused by my eyes trying to adjust to a reading focal length while looking through the distance prescription.

Other possibilities include suddenly being afflicted with vertigo (odd), having a problem with the prescription strength or prescription location on my current progressive bifocals (possible), or something attributed to the 45+ year old fracture on the back of my skull and advancing age (odd).

I am curious if anyone else here suffered similar nausea problems which were solved by using a Double-D grind on their bifocal lenses for car work or similar. FWIW - I have worn bifocals for ~15 years without issue until just the past eight months.

Thanks,



->Posting last edited on Sun, 30 Nov 2014 15:18:39.
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