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Effects of vergence findings on prepresbyopic near spectacle prescriptions

1 January 2000


Our study investigated effects of vergence findings on both prepresbyopic and presbyopic near spectacle prescriptions. It is possible that individuals with inadequate convergence abilities, maintain excessive accommodative effort for long periods of time to compensate for the convergence problem. This may result in a greater accommodative amplitude than one would expect based on age alone. If true, perhaps vision therapy programs utilizing sustained positive accommodative techniques, may delay the onset of presbyopia and the need for bifocals or reading glasses. We hypothesize that 36 - 50 year olds with convergence deficits will have larger accommodative amplitudes than an age matched control group. Five hundred forty clinic records were sampled from age 36 - 50 from the Pacific University Family Vision Facilities between October 25, 1998 and January 26, 1999. Data from completed vision examinations were collected and analyzed using the Statview Analysis Systems. A significant correlation was found between age and the add prescription, distance phoria and the add prescription, and the fused cross cylinder and the add prescription. No significant correlation was found between any of the near vergence findings (Base Out, Base In phoria, and NPC) amount of add, however, additional studies are needed to further investigate the role distance phoria plays in the amount of add given to patients.


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