1. Bourne RRA, Adelson J, Flaxman S, Briant P, Bottone M, Vos T, et al. Global prevalence of blindness and distance and near vision impairment in 2020: progress towards the vision 2020 targets and what the future holds. Invest Ophthalmol Vis Sci. 2020;61:2317.
2. Flaxman SR, Bourne RRA, Resnikoff S, Ackland P, Braithwaite T, Cicinelli MV, et al. Global causes of blindness and distance vision impairment 1990–2020: a systematic review and meta-analysis. Lancet Glob Heal. 2017;5:e1221–34.
3. Shell JW. Pharmacokinetics of topically applied ophthalmic drugs. Surv Ophthalmol. 1982;26:207–18.
4. Lang JC. Ocular drug delivery conventional ocular formulations. Adv Drug Deliv Rev. 1995;16:39–43.
5. Gaudana R, Jwala J, Boddu SHS, Mitra AK. Recent perspectives in ocular drug delivery. Pharm Res. 2009;26:1197–216.