Purpose: To estimate the prevalence of convergence insufficiency (CI) among 12–16 year old school children across six schools in Gwalior district of state Madhya Pradesh, India. Methods: The 9th and 10th grade school students in the age group of 12–16yrs were screened in school settings in six different schools across Gwalior. Eligible children with 6/9 or better visual acuity in each eye, minimal refractive error, no strabismus and esophoria at near and systemic illness were evaluated according to standard protocol to determine the presence and severity of CI. The children were classified according the following number of clinical signs. 1. Convergence insufficiency symptom survey (CISS) score—greater than 16 (based on research by CITT group). 2. Near point of convergence (NPC) with accommodative target—break greater than 6 cm (Morgan criteria). 3. Positive fusional vergence (PFV)—less than 15Δ (by step vergence method using horizontal prism bar) (Morgan criteria). 4. Near exophoria with Maddox wing—greater than 3Δ exophoria. Results: Of the 1014 children who were screened, only 818(80.67%) were eligible for the study. Of the 818, the data collected were classified and grouped as—No CI (less than 2 clinical signs) (62.10%), Suspect CI (2 clinical signs) (23.42%) and definite CI (3 or more clinical signs) (14.42%). The mean CISS scores for the 818 subjects in the study was 12 ± 8.4. The mean NPC was 6.8 cms ± 2.2(break value).The mean near PFV (step vergence with horizontal prism bar) was break 24ΔBO ± 10.87 and recovery 20ΔBO ± 9.69. The mean exophoria was 3Δ ± 2.1. Conclusions: The findings suggest that CI (defined as suspect and definite CI) is frequent (38%) among 12–16 year old school children and tests for CI should be routinely carried out in this age group to rule out CI. There was a steady increase in prevalence of CI with increasing age. Gender has a significant role in CI especially the females are 1.5 times more prone to convergence insufficiency than males in the study.