[1] Dr Om Parkash Eye Inst, Pediat Ophthalmol & Strabismus, Amritsar, Punjab, India
[2] Dr Om Parkash Eye Inst, Consultant Cornea External Dis Trauma Ocular Surf, Amritsar, Punjab, India
[3] All India Inst Med Sci, Dept Ophthalmol, Bibinagar, Telangana, India
[4] All India Inst Med Sci, Cataract Glaucoma Refract Squint Pediat Ophthalm, Bibinagar, Telangana, India
[5] Worcestershire Acute Hosp NHS Trust, Specialty Doctor Ophthalmol, Worcester WR5 1DD, England