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Predictor factors of prism effectiveness in young adults with convergence insufficiency.

Authors :
Hashemi H
Jafarzadehpur E
Nabovati P
Yekta A
Aghamirsalim M
Kamali M
Mirzajani A
Khabazkhoob M
Source :
Clinical & experimental optometry [Clin Exp Optom] 2021 Jul; Vol. 104 (5), pp. 611-616. Date of Electronic Publication: 2021 Feb 27.
Publication Year :
2021

Abstract

Clinical relevance : The findings of this study can be useful in the process of patient selection as well as in optimising the prescription of the prism in patients with convergence insufficiency. Background : To determine the relationship between the demographic variables and baseline clinical characteristics with the prism effectiveness in young adults with convergence insufficiency. Methods : Sixty-four young adults with convergence insufficiency entered a randomised clinical trial and were randomly assigned to either treatment or placebo groups. For participants in the treatment group, the near optical correction containing base-in prism was determined based on the Sheard's criterion. Participants in the placebo group received near optical correction. After three months of using the assigned correction, the outcome examinations were performed. Results : In the univariate analysis, a remote near point of convergence, a higher baseline symptoms score, and a higher prescribed prism power showed a significant relationship with the increase in prism effectiveness. A significant inverse relationship was found between the near positive fusional vergence, vergence facility, and prism adaptation rate with the prism effectiveness. Based on the results of the multiple regression, the prism adaptation rate was the only independent predictor factor of prism effectiveness, so that the prism effectiveness increased by 0.60 for each per cent reduction in prism adaptation rate. Conclusion : Prism adaptation is the only independent predictive factor of prism effectiveness in young adults with convergence insufficiency. Based on the findings of the present study, it is recommended that careful assessment of prism adaptation be considered before considering prism prescription.

Details

Language :
English
ISSN :
1444-0938
Volume :
104
Issue :
5
Database :
MEDLINE
Journal :
Clinical & experimental optometry
Publication Type :
Academic Journal
Accession number :
33689635
Full Text :
https://doi.org/10.1080/08164622.2021.1878828