Table 1. Characteristics and quality of studies included in the Meta-analysis.

		OCT		No. of eyes		Mean Age (years)		Gender (Male/Female)		NOS Scale
Author(s) Year	Country	Manufacturer	Model	PD	HC	PD	HC	PD	HC	Selection	Comparability	Expose	Total Score
Morgia/2013 [22]	Italy	Carl Zeiss	Stratus	81	86	65.6	65.5	24/19	34/52	***	*	**	6
Aaker/2010 [9]	USA	Heidelberg	Spectralis	18	19	64	67	13/5	9/10	****	*	**	7
Moschos/2011 [5]	Greece	Carl Zeiss	Stratus Model 3000	32	40	57	52	9/7	10/10	***	*	**	6
Albrecht/2012 [4]	Germany	Heidelberg	Spectralis	80	70	61.2	NR	30/10	NR	***	*	**	6
Tsironi/2012 [21]	Greece	Carl Zeiss	Stratus	24	24	66.6	64.3	14/10	11/13	***	**	**	7
Rohani/2012 [20]	Iran	Topcon	3D-OCT 1000 Mark II	54	50	54.6	55.0	40/14	34/16	****	*	**	7
Kirbas/2013 [19]	Turkey	Carl Zeiss	Cirrus HD	84	80	59.3	57.0	24/28	24/16	***	*	**	6
Inzelberg/2004 [18]	Israel	NR	NR	10	10	57	52	5/5	NR	***	*	**	6
Archibald/2011 [7]	UK	Carl Zeiss	Stratus Model 3000	34	17	71.6	71.3	22/15	9/10	****	**	**	8
Satue/2013 [17]	Spain	Carl Zeiss Heidelberg	Cirrus HD Spectralis	100	100	64	64	82/18	NR	**	*	**	5
Altintas/2008 [6]	Turkey	Carl Zeiss	Stratus Model 3000	34	22	59.3	58.1	9/8	6/5	**	*	**	5
Garcia-Martin/2012 [24]	Spain	Carl Zeiss Heidelberg	Cirrus HD Spectralis	75	75	64.4	64.2	45/30	45/30	***	*	**	6
Sen/2013 [23]	Turkey	Optovue	RTVue-100	18	11	63.56	61.18	8/10	5/6	****	**	**	8

PD = Parkinson's disease; HC = healthy controls; RNFL = retinal nerve fiber layer; NOS = Newcastle-Ottawa Scale; NR = not reported.