Upwards of 70% of adolescent concussion patients present with visual dysfunction. Total time on the King-Devick (K-D) Test or average distance on the near point of convergence (NPC) test contributes to clinical decision-making. However, performance deterioration across multiple trials or cards has not been previously reported and may require consideration for a targeted rehabilitation program. PURPOSE: To determine if oculomotor fatigue (OMF) was present following a sport-related concussion (SRC) in adolescents. METHODS: 121 Student-athletes (15.3 ± 1.4 years; 51 Female/70 Male) were administered Cards 1-3 of the K-D and then three trials of the NPC during their initial concussion evaluation (3.6 ± 1.8 days post-injury). OMF was defined as exceeding the sample mean difference from Trial 1 to Trial 3 for the NPC and Card 1 to Card 3 for the K-D. Descriptive statistics, Mann-Whitney U tests, Independent-samples Median Tests, and Cronbach’s α were performed using SPSS 25. RESULTS: 33% and 26% of the cohort presented with OMF on the NPC and K-D, respectively. The sample mean difference from Trial 1 to 3 for the NPC was 4.33cm and 4.72s for K-D Card 1 to 3. Using the cutoff of 4.33cm on the NPC, the OMF group exhibited worse median performance for all NPC trials (p ≤ 0.002) and all K-D cards (p ≤ 0.029), except Card 1 (p = 0.52). Internal consistency was high for the OMF group on the NPC (Cronbach’s α = 0.967) and K-D (Cronbach’s α = 0.860) and non-fatigue group for NPC (Cronbach’s α = 0.987) and K-D (Cronbach’s α = 0.960). CONCLUSIONS: It appears that there was a decline in performance on the NPC (33%) and K-D (26%) in a subset of our cohort. Interestingly, internal consistency remained high for the measures, even when OMF group performance was significantly worse. Future research is warranted to determine if OMF is a clinical biomarker for underlying attentional, cortical, cerebellar, or vestibular disorders. Our findings are specific to adolescent, sport-related concussion patients seen within a week of their injury using clinician-administered NPC and version 1 of the K-D plastic cards and should not be generalized.