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Effects of continued near point stress on phorias and vergences

1 March 1981


A study was conducted to determine the change in phorias and vergences with near point stress. The functional theory of optometry states that when subjects are exposed to near point stress they undergo systematic changes: the disorganization stage and the reorganization stage. Concessions are made in the visual systems performance as a result of the near point stress. Near phoria and vergence changes are manifestations of the concessions. First year dental students were used as subjects and were tested at three times during the period of a year. Results indicated no significant change in the near phoria, but distance convergence recoveries, near convergence breaks, and near divergence recoveries increased significantly during the school year. The results did not support the functional theory of near point stress and its effects on the visual system.


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