The Experts below are selected from a list of 280083 Experts worldwide ranked by ideXlab platform
Elena Kokoliou - One of the best experts on this subject based on the ideXlab platform.
-
Skin & hair properties evaluation methods
internal, 2017Co-Authors: Elena KokoliouAbstract:for razor products and cosmetic products associated to them, skin surface measurements have become indispensable as they help us assess the effect of BIC
Shiowwen Liou - One of the best experts on this subject based on the ideXlab platform.
-
Estimation accuracy of surgically induced astigmatism on the cornea when neglecting the posterior corneal Surface Measurement.
Acta ophthalmologica, 2009Co-Authors: Li-sheng Cheng, Chingyao Tsai, Ray Jui-fang Tsai, Shiowwen LiouAbstract:. Purpose: To evaluate the accuracy of corneal surgically induced astigmatism (SIA) estimation when neglecting the posterior corneal Surface Measurement. Methods: Fifty right eyes undergoing phacoemulsification were measured with a rotating Scheimpflug camera (Pentacam; Oculus Inc., Wetzlar, Germany) both before and after surgery. Clear corneal incisions with one suture were used in the phacoemulsification surgery. The keratometric corneal SIA (KSIA) was derived using the anterior corneal Surface Measurement and the keratometric index (1.3375) while neglecting the posterior corneal Surface Measurement. The Pentacam-derived total corneal SIA (PSIA) was derived by vergence tracing and polar value analysis [KP(135) and KP(180)] of the Measurements on both corneal Surfaces. Results: The mean arithmetic estimation errors of the KSIA for the PSIA were 0.16 ± 0.32 (−0.52 to 1.14) D for the KP(135), and −0.02 ± 0.30 (−0.75 to 1.29) D for the KP(180). There was a significant difference between the KP(135) components of the KSIA and PSIA. Bivariate analysis revealed a statistically significant difference between the combined means of the KSIA and PSIA. Overall, 24% had either a KP(135) component of the KSIA that differed by > 0.50 D from that of the PSIA or a KP(180) component of the KSIA that differed by > 0.50 D from that of the PSIA. The blurring strength caused by neglecting the posterior corneal Measurement was > 0.50 D in 24% of eyes. Conclusion: Neglecting the posterior corneal Surface Measurement may lead to significant deviation in the corneal SIA estimation after phacoemulsification in a proportion of eyes.
-
accuracy of corneal astigmatism estimation by neglecting the posterior corneal Surface Measurement
American Journal of Ophthalmology, 2009Co-Authors: Jauder Ho, Chingyao Tsai, Shiowwen LiouAbstract: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.
Jauder Ho - One of the best experts on this subject based on the ideXlab platform.
-
accuracy of corneal astigmatism estimation by neglecting the posterior corneal Surface Measurement
American Journal of Ophthalmology, 2009Co-Authors: Jauder Ho, Chingyao Tsai, Shiowwen LiouAbstract: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.
Chingyao Tsai - One of the best experts on this subject based on the ideXlab platform.
-
Estimation accuracy of surgically induced astigmatism on the cornea when neglecting the posterior corneal Surface Measurement.
Acta ophthalmologica, 2009Co-Authors: Li-sheng Cheng, Chingyao Tsai, Ray Jui-fang Tsai, Shiowwen LiouAbstract:. Purpose: To evaluate the accuracy of corneal surgically induced astigmatism (SIA) estimation when neglecting the posterior corneal Surface Measurement. Methods: Fifty right eyes undergoing phacoemulsification were measured with a rotating Scheimpflug camera (Pentacam; Oculus Inc., Wetzlar, Germany) both before and after surgery. Clear corneal incisions with one suture were used in the phacoemulsification surgery. The keratometric corneal SIA (KSIA) was derived using the anterior corneal Surface Measurement and the keratometric index (1.3375) while neglecting the posterior corneal Surface Measurement. The Pentacam-derived total corneal SIA (PSIA) was derived by vergence tracing and polar value analysis [KP(135) and KP(180)] of the Measurements on both corneal Surfaces. Results: The mean arithmetic estimation errors of the KSIA for the PSIA were 0.16 ± 0.32 (−0.52 to 1.14) D for the KP(135), and −0.02 ± 0.30 (−0.75 to 1.29) D for the KP(180). There was a significant difference between the KP(135) components of the KSIA and PSIA. Bivariate analysis revealed a statistically significant difference between the combined means of the KSIA and PSIA. Overall, 24% had either a KP(135) component of the KSIA that differed by > 0.50 D from that of the PSIA or a KP(180) component of the KSIA that differed by > 0.50 D from that of the PSIA. The blurring strength caused by neglecting the posterior corneal Measurement was > 0.50 D in 24% of eyes. Conclusion: Neglecting the posterior corneal Surface Measurement may lead to significant deviation in the corneal SIA estimation after phacoemulsification in a proportion of eyes.
-
accuracy of corneal astigmatism estimation by neglecting the posterior corneal Surface Measurement
American Journal of Ophthalmology, 2009Co-Authors: Jauder Ho, Chingyao Tsai, Shiowwen LiouAbstract: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.
Li-sheng Cheng - One of the best experts on this subject based on the ideXlab platform.
-
Estimation accuracy of surgically induced astigmatism on the cornea when neglecting the posterior corneal Surface Measurement.
Acta ophthalmologica, 2009Co-Authors: Li-sheng Cheng, Chingyao Tsai, Ray Jui-fang Tsai, Shiowwen LiouAbstract:. Purpose: To evaluate the accuracy of corneal surgically induced astigmatism (SIA) estimation when neglecting the posterior corneal Surface Measurement. Methods: Fifty right eyes undergoing phacoemulsification were measured with a rotating Scheimpflug camera (Pentacam; Oculus Inc., Wetzlar, Germany) both before and after surgery. Clear corneal incisions with one suture were used in the phacoemulsification surgery. The keratometric corneal SIA (KSIA) was derived using the anterior corneal Surface Measurement and the keratometric index (1.3375) while neglecting the posterior corneal Surface Measurement. The Pentacam-derived total corneal SIA (PSIA) was derived by vergence tracing and polar value analysis [KP(135) and KP(180)] of the Measurements on both corneal Surfaces. Results: The mean arithmetic estimation errors of the KSIA for the PSIA were 0.16 ± 0.32 (−0.52 to 1.14) D for the KP(135), and −0.02 ± 0.30 (−0.75 to 1.29) D for the KP(180). There was a significant difference between the KP(135) components of the KSIA and PSIA. Bivariate analysis revealed a statistically significant difference between the combined means of the KSIA and PSIA. Overall, 24% had either a KP(135) component of the KSIA that differed by > 0.50 D from that of the PSIA or a KP(180) component of the KSIA that differed by > 0.50 D from that of the PSIA. The blurring strength caused by neglecting the posterior corneal Measurement was > 0.50 D in 24% of eyes. Conclusion: Neglecting the posterior corneal Surface Measurement may lead to significant deviation in the corneal SIA estimation after phacoemulsification in a proportion of eyes.
