This study investigated the clinical effects of the head-mounted display on the normal eye to obtain reliable safety data in adolescents. The study included 60 volunteers aged on average 14.7 ±1.3 years (13-18) of which 59% were female. Mean best corrected visual acuity was 20/20. Mean refractive error was -3.1±2.6D for the right eye and -3.0±2.4D for the left eye. Mean angle of deviation was 0.5±1.6PD at distance fixation and 0.5±1.7PD at near fixation. Mean near point of accommodation was 8.7±1.8cm with stereopsis of 60”. Forty percent and 31% showed myopic changes immediately after watching 3D movie and virtual reality applications respectively. For 3D movies, 25% showed binocular myopic shifts and 75% showed monocular myopic shifts. For virtual reality, 22% showed binocular and 78% monocular myopic shifts. All recovered within 40 minutes. The authors conclude there are no significant effects of watching head-mounted displays for 30 minutes on the normal adolescent eye.