Most international blind sports follow the B1 to B3 classification system set by the International Blind Sports Federation (IBSA):

• B1: No light perception in either eye, or light perception without the ability to recognize shapes.
• B2: Visual acuity up to and including 2/60, or visual field less than 5°.
• B3: Visual acuity better than 2/60 up to and including 6/60, or visual field between 5° and 20°.

Classification is based on two main factors: visual acuity (clarity of vision) and visual field (how wide one can see), measured in the better eye with the best possible correction (e.g., glasses or contact lenses).

To be eligible, an athlete must have a permanent impairment in both eyes. If one eye is fully sighted, the athlete does not qualify for classification.

1. Athletes may download the MDF form and carry a duly filled copy, signed and stamped by an ophthalmologist, along with other relevant test reports (if any), when called for classification.
2. Athletes will be required to undergo a classification assessment by trained professionals before the event.
3. Since vision affects each sport differently, classification must be conducted separately for each sport an athlete participates.