The Brien Holden Vision Institute (BHVI) Myopia Calculator – one of the most widely used clinical tools globally for assessing a child’s risk of developing myopia – has been updated with a new Outdoor Time Filter that enables eye care professionals (ECPs) to evaluate effects of outdoor time on myopia onset risk and expected rate of progression.
The calculator, which provides evidence-based predictions across treatment, prevention and management options, is available free of charge to ECPs worldwide at bhvi.org.
The BHVI calculator has been developed in partnership with the Shanghai Eye Disease Prevention and Treatment Centre (China), Ulster University (UK), and Linnaeus University (Sweden).
The scientific foundation of BHVI’s modelling draws on peer-reviewed research and was developed through international collaboration with the International Myopia Institute (IMI).
The calculator, which provides evidence-based predictions across treatment, prevention, and management options, is available free of charge
Research shows that spending at least two hours outdoors each day is associated with a reduced risk of developing myopia in school-aged children. While gaps remain in defining optimal light parameters (intensity, spectrum, and timing), there is strong consensus supporting increased outdoor activity as an evidence-based strategy to delay myopia onset.1
Reference
- Ashby R, Harb EN, Ostrin LA, et al. IMI: The role of light in refractive development and myopia: Evidence from animal and human studies. Invest. Ophthalmol. Vis. Sci. 2025;66(15):5. doi: 10.1167/iovs.66.15.5.
