The effect of base-in prism on vision-related symptoms and clinical characteristics of young adults with convergence insufficiency; a placebo-controlled randomised clinical trial.
Payam NabovatiMohammad KamaliAli MirzajaniEbrahim JafarzadehpourMehdi KhabazkhoobPublished in: Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists) (2019)
The base-in prism reduced symptoms in young adults with convergence insufficiency, while it had no significant effect on the near point of convergence, near positive fusional vergence, vergence facility and AC/A ratio. However, the results of this study only supports the symptomatic effectiveness of prism in the short term and further studies are needed to assess the long-term effect of prism.