Article PDF :

Veiw Full Text PDF

Article type :

Review Article

Author :

Shamit Pal, Priye Suman Rastogi, Ravi Ranjan, Gaurav Dubey, Om Shankar Kamat, Souvik Chattopadhayay, Shamit Pal, Priye Suman Rastogi, Ravi Ranjan, Gaurav Dubey, Om Shankar Kamat, Souvik Chattopadhayay

Volume :

11

Issue :

4

Abstract :

This study aims to evaluate the variability in near point of convergence (NPC) break and recovery values across different methodologies and populations to improve the understanding of convergence insufficiency (CI) diagnosis. It seeks to analyze the influence of factors such as age, font size, repetition, and testing distance on NPC values. Additionally, the study highlights the inconsistencies in assessment methodologies currently used in CI diagnosis, which can affect the reliability and accuracy of NPC measurements. Convergence insufficiency (CI) is a common vergence anomaly, affecting 0.85-13% of the population. Prolonged near work can lead to excessive accommodation and vergence, resulting in diminished binocular functions and symptoms such as asthenopia, headaches, and eyestrain. A comprehensive literature review from sources such as PubMed, PubMed Central, and ResearchGate revealed significant variations in NPC values. Despite being a widely used diagnostic tool, NPC assessment lacks standardized protocols. The variability in NPC break and recovery values across different studies suggests inconsistencies in testing methods, including differences in target characteristics, age groups, and testing conditions. There is a need for a more standardized approach to improve the reliability and clinical applicability of NPC measurements. The lowest break value recorded was 5 cm using a 9-point font size objective, whereas the highest recovery point reached 15.03 cm with a long scale and accommodative target in individuals aged