Table 1. The Effect of Smoking onmeibomian gland dysfunction (MGD) Parameters.

Parameters	Smokers	Non-smokers
Both sexes
OSDI	36.15±0.93	35.85±0.39
TBUT	4.00±0.14	3.96±0.05
CFS	1.70±0.15	1.84±0.06
SIT	6.29±0.30	6.92±0.15
Lid margin abnormality score**	0.78±0.04	0.60±0.02
Meibomian gland expressibility score	1.26±0.05	1.37±0.02
Meibum Score**	1.03±0.05	0.82±0.02
Male
OSDI	35.77±0.98	34.62±0.70
TBUT	4.10±0.16	4.05±0.11
CFS	1.57±0.15	1.78±0.11
SIT	6.43±0.32	7.15±0.28
Lid margin abnormality score**	0.80±0.04	0.62±0.03
Meibomian gland expressibility score	1.21±0.06	1.32±0.04
Meibum Score**	1.05±0.06	0.81±0.04

Data shown as mean ± SE;

** P<0.01

OSDI: Ocular Surface Disease Index; TBUT: tear film breakup time; CFS: corneal fluorescein staining; SIT: Schirmer I test.