Table 3. Assessment of study quality using modified NOS with respect to fundal images.

Paper	Sample size	Validation technique	Unique database	Definition of glaucoma	CI	AUROC	Total
Nayak et al 2009[42]						X	1
Bock et al 2010[51]	X	X	X	X		X	5
Acharya et al 2011[43]		X					1
Mookiah et al 2012[44]		X				X	2
Chakrabarty et al 2016[41]	X		X	X		X	4
Issac et al 2015[45]		X					1
Maheshwari et al 2017[46]	X	X					2
Singh et al 2016[47]		X					1
Maheshwari et al 2017[48]	X	X					2
Raghavendra et al 2018[49]	X						1
Ahn et al 2018[63]	X		X	X		X	4
Christopher et al 2018[52]	X	X	X		X	X	5
Li et al 2018[53]	X		X		X	X	4

CI: Confidence interval; AUROC: Area under the receiver operating characteristics curve; NOS: Newcastle-Ottawa Scale; OCT: Ocular coherence tomography.