Abstract
·AlM ：TO study the e仟ects of Sodium HyaIuronate (HA)and Bion Tears on corneaI thickness in adult myopic patients．
·METHODS：A totaI of 38 cases(76 eyes)were involvedin this study． Three consecutive corneal measurements
(the thinnest point of the cornea．THN)were evaIuatedbefore and half an hour after the inst⋯ation of one drop of
HA in one eye and Bion Tears in the other at random withthe Orbscan Corneal Topography System II(Orbscan，
lnc，Salt Lake City．UT，USA．Version 3．00E)．
· RESULTS： There were no significant between—groupdifferences in baseline va riable(t=0．264)．Thirty minutesafter the inst⋯ation of HA and Bion tears． THN weresignificantly increased by 5．57±7．00pm (t=4．906，P<0．01)and 7．89±7．64v m (t=6．369，P<0．01)respectively．However．there were no between—group diferences inTHN changes(t=1．381．P>0．05)．1ncrease in the corneaIthickness were found in 32 eyes(84％ )and 33 eyes(87％ )for the HA and Bion tears g roup，respectively．
·CONCLUSION： ArtificiaI tears incIuding HA and BionTears can significantly increase the corneal thickness in a
short period of time． CorneaI thickness can be used asone of the objective indices for evaluating the quaIity and
therapeutic role of a rtificiaI tears．
·KEYW ORDS：artificiaI tears：corneaI thickness；OrbscanCorneal Topography System IID0I：10．3969／i．issn．1672-5l23．2009．01．003

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