Table 1.

Studies on symmetry of retinal layers between the right and left eyes using optical coherence tomography

Research	Publication year	Retinal layers	Tolerance limit calculation (yes/no)	Population	OCT type	Sector analysis (yes/no)
Kurimoto et al.[6]	2000	RNFL	No	Normal	ONH	PRNFL
Park et al.[9]	2005	RNFL	No	Normal	ONH	PRNFL
Budenz [10]	2008	RNFL	Yes	Normal	ONH	PRNFL
Asrani et al.[4]	2011	RNFL	No	Normal	Macula	Posterior pole grid
Larsson et al. [11]	2011	RNFL	Yes	Normal	ONH	PRNFL
Altemiret al. [12]	2013	RNFL	Yes	Normal	Macula	ETDRS
Dalgliesh et al. [14]	2015	RNFL	No	Normal	Macula	ETDRS
Al-Haddad et al. [13]	2014	RNFL	No	Normal	Macula	ETDRS
Alluwimi et al. [15]	2014	RNFL	No	Normal	Macula	Posterior pole grid
Hwang et al. [18]	2014	RNFL	Yes	Normal	Macula	ETDRS
Lee et al. [19]	2015	GCL	Yes	Normal, glaucoma patients	Macula	No
Dalgliesh et al. [20]	2015	RNFL, total macula	Yes	Normal	Macula	ETDRS
Zhou et al. [21]	2016	GCL	No	Normal	Macula	ETDRS
Yang et al. [22]	2016	RNFL, PCT, SFCT	Yes	Isometropia patients	EDI OCT	ETDRS
Lee et al.[23]	2016	RNGL, GCIPL, ganglion cell complex, total retina	No	Normal, glaucoma patients	Macula	No
Yamada et al. [24]	2014	RNFL, GCL, ganglion cell complex, total retina	Yes	Normal, preperimetric, early, and advance glaucoma	Macula	Upper and lower hemi retinal

RNFL – Retinal nerve fiber layer; PRNFL – Peripapillary RNFL; OCT – Optical coherence tomography; GCL – Ganglion cell layer; PCT – Peripapillary choroidal thickness; SFCT – Subfoveal choroidal thickness; ONH – Optic nerve head; EDI – Enhanced depth imaging; ETDRS – Early Treatment Diabetic Retinopathy Study; GCIPL – Ganglion cell and inner plexiform layer