We review what blue light filters do, how they became so popular in the retail industry, and the current evidence-based research on its effectiveness on ocular health and digital eye strain.\nResources:\n1. CBC Video Documentary on YouTube: https://www.youtube.com/watch?v=NkJY9bgLyBE\n2. Tosini G, Ferguson I, Tsubota K. Effects of blue light on the circadian system and eye physiology.\xa0Molecular Vision\xa02016; 22: 61-72.\n3. Tatsiana P, Rosenfield M. Blue-blocking filters and digital eyestrain.\xa0Optometry and Vision Science\xa02019; 96(1): 48-54.\n4. O\u2019Hagan JB, Khazova M, Price LLA. Low-energy light bulbs, computers, tablets, and the blue light hazard.\xa0Eye\xa02016; 30: 230-233.\n5. Canadian Association of Optometrists:\xa0https://opto.ca/health-library/blue-light-is-there-a-risk-of-harm\n6. Zhao HL, Jiang J, Yu J, et al. Role of short-wavelength filtering lenses in delaying myopia progression and amelioration of asthenopia in juveniles.\xa0Int J Ophthalmol\xa02017; 10(8): 1261-1267.