preferred_name: Visual acuity loss (none to moderate (20/16 to 20/100))
preferred_name_lc: visual acuity loss (none to moderate (20/16 to 20/100))
label: Visual acuity loss (none to moderate (20/16 to 20/100))
label_lc: visual acuity loss (none to moderate (20/16 to 20/100))