| Ho JD |
------>authors3_c=??? ------>paper_class1=1 ------>Impact_Factor=2.628 ------>paper_class3=2 ------>paper_class2=1 ------>vol=147 ------>confirm_bywho=1 ------>insert_bywho=jauder ------>Jurnal_Rank=22.2 ------>authors4_c= ------>comm_author= ------>patent_EDate=None ------>authors5_c= ------>publish_day=1 ------>paper_class2Letter=None ------>page2=795 ------>medlineContent= ------>unit=E0115 ------>insert_date=20081212 ------>iam=1 ------>update_date=None ------>author=??? ------>change_event=4 ------>ISSN=0002-9394 ------>authors_c=??? ------>score=458 ------>journal_name=American Journal of Ophthalmology ------>paper_name=Accuracy of Corneal Astigmatism Estimation by Neglecting the Posterior Corneal Surface ------>confirm_date=None ------>tch_id=093018 ------>pmid=19232562 ------>page1=788 ------>fullAbstract=PURPOSE: To evaluate the accuracy of corneal astigmatism estimation by neglecting the posterior corneal surface measurement. DESIGN: Prospective, observational study. METHODS: The right eyes of 493 subjects were measured with a rotating Scheimpflug camera (Pentacam; Oculus, Wetzlar, Germany). The keratometric corneal astigmatism (KA) was obtained by using the anterior corneal surface measurement and the keratometric index (1.3375) while neglecting the posterior corneal surface measurement. The Pentacam-derived total corneal astigmatism (PA) was derived by doubled-angle vector analysis of the astigmatisms on both corneal surfaces. RESULTS: The mean arithmetic and absolute estimation errors of the KA magnitude for the PA magnitude were -0.06 +/- 0.28 diopters (D) (range, -0.59 to 0.91 D) and 0.24 +/- 0.16 D (range, 0 to 0.91 D), respectively. The mean arithmetic and absolute estimation errors of the KA angle for the PA angle were -0.6 degrees +/- 12.7 degrees (range, -69.9 degrees to 83.4 degrees) and 7.4 degrees +/- 10.3 degrees (range, 0 degrees to 83.4 degrees), respectively. Among all eyes, 142 eyes (28.8%) had either a KA magnitude that differed by > 0.50 D from the PA magnitude or a KA angle that differed by > 10 degrees from the PA angle. For the 282 eyes with a KA magnitude exceeding 1.0 D (that are candidates for intraoperative correction of a preexisting astigmatism during cataract surgery), 29 eyes (10.3%) had either a KA magnitude that differed by > 0.50 D from the PA magnitude or a KA angle that differed by > 10 degrees from the PA angle. CONCLUSIONS: Neglecting the posterior corneal surface measurement may lead to significant deviation in the corneal astigmatism estimation in a proportion of eyes. ------>tmu_sno=None ------>sno=20752 ------>authors2=Tsai CY ------>authors3=Liou SW ------>authors4= ------>authors5= ------>authors6= ------>authors6_c= ------>authors=Ho JD ------>delete_flag=0 ------>SCI_JNo=None ------>authors2_c=??? ------>publish_area=0 ------>updateTitle=Accuracy of corneal astigmatism estimation by neglecting the posterior corneal surface measurement. ------>language=2 ------>check_flag=None ------>submit_date=None ------>country=None ------>no=5 ------>patent_SDate=None ------>update_bywho=None ------>publish_year=2009 ------>submit_flag=None ------>publish_month=5 |