There are multiple definitions:

1. Borg scale dyspnea index(English)

   • used to measure breathlessness at rest
   • FEV1, OLD
   • Pulmonology, Scoring systems/scales
   • https://doi.org…chest.96.6.1247

2. blepharospasm disability index(English)

   • BSD, BoNT/A
   • Ophthalmology, Disability
   • https://doi.org…jns.2016.05.033