AIM： To Investigate the added value of using a Diaton transpalpebral tonometer （DT） to measure lOP in keretoconus. Most type of tonometers use corneal applanation or biomechanical resistance to measure intraocular ...AIM： To Investigate the added value of using a Diaton transpalpebral tonometer （DT） to measure lOP in keretoconus. Most type of tonometers use corneal applanation or biomechanical resistance to measure intraocular pressure （lOP）; however, these factors can be altered by keratoconus. Specifically, we examined whether DT can detect false-negative low Goldmann applanation tonometry （AT） measurements. METHODS： Patients with keratoconus were recruited from our tertiary academic treatment center. Measurements included AT and DT （in random order） and Scheimpflug imaging. An age- and gender-matched group of control subjects with no history of corneal disease or glaucoma was also recruited. RESULTS： In total, 130 eyes from 66 participants were assessed. In the keratoconus group, mean AT was 11.0± 2.6, mean DT 11±5.5 （P =0.729）and the two measures were correlated significantly（P=0.006, R=0.323）. However, a Bland-Altman plot revealed a wide distribution and poor agreement between both measurements. Previous corneal crosslinking, corneal pachymetry, and Krumeich classification had no effect on measured IOP. CONCLUSION： Measurements obtained using a Diaton tonometer are not affected by corneal biomechanics; however, its poor agreement with Goldmann AT values calls into question the added value of using a Diaton tonometer to measure lOP in keratoconus.展开更多
文摘AIM： To Investigate the added value of using a Diaton transpalpebral tonometer （DT） to measure lOP in keretoconus. Most type of tonometers use corneal applanation or biomechanical resistance to measure intraocular pressure （lOP）; however, these factors can be altered by keratoconus. Specifically, we examined whether DT can detect false-negative low Goldmann applanation tonometry （AT） measurements. METHODS： Patients with keratoconus were recruited from our tertiary academic treatment center. Measurements included AT and DT （in random order） and Scheimpflug imaging. An age- and gender-matched group of control subjects with no history of corneal disease or glaucoma was also recruited. RESULTS： In total, 130 eyes from 66 participants were assessed. In the keratoconus group, mean AT was 11.0± 2.6, mean DT 11±5.5 （P =0.729）and the two measures were correlated significantly（P=0.006, R=0.323）. However, a Bland-Altman plot revealed a wide distribution and poor agreement between both measurements. Previous corneal crosslinking, corneal pachymetry, and Krumeich classification had no effect on measured IOP. CONCLUSION： Measurements obtained using a Diaton tonometer are not affected by corneal biomechanics; however, its poor agreement with Goldmann AT values calls into question the added value of using a Diaton tonometer to measure lOP in keratoconus.
