TY - JOUR
T1 - Pressure phosphene tonometry versus Goldmann applanation tonometry for measuring intraocular pressure before and after LASIK
AU - Shemesh, Gabi
AU - Man, Oran
AU - Michaeli, Adi
AU - Varssano, David
AU - Lazar, Moshe
PY - 2007/4
Y1 - 2007/4
N2 - PURPOSE: To compare pressure phosphene tonometry with Goldmann applanation tonometry for measuring intraocular pressure (IOP) before and after LASIK. METHODS: Forty-three (18 men and 25 women) consecutive healthy patients underwent complete pre- and postoperative LASIK ophthalmologk: assessments including manifest and cycloptegic refraction, keratometry, and central corneal thickness. Three repetitive sets of pressure phosphene tonometry and Goldmann applanation tonometry measurements were performed the day before and 3 months following uneventful LASIK. RESULTS: Mean preoperative spherical equivalent refraction was -4.70±2.50 diopters (D) (range: -1.50 to -12.90 D) and mean preoperative keratometry was 43.95±1.08 D. After LASIK, spherical equivalent refraction was +0.23±0.11 D and mean keratometry was 39.46±2.28 D. Preoperative pressure phosphene tonometry (12.16±1.58 mmHg) and Goldmann applanation tonometry (12.01±1.55 mmHg) IOP measurements were similar. Postoperative IOP was 10.30±1.16 mmHg with Goldmann applanation tonometry and 12.20±1.62 mmHg with pressure phosphene tonometry. The postoperative IOP difference between Goldmann applanation tonometry and pressure phosphene tonometry was 0.15±1.12 mmHg (P=.41). The mean change in pachymetry after LASIK was 68.73±73 μm. The change in Goldmann applanation between preoperative and postoperative LASIK values was 1.71±1.43 mmHg (P<.0001), a change that was strongly correlated with changes in corneal thickness (R=0.75, P<.0001) and keratometry (R=0.72, P<.0001). No such correlations were found with pressure phosphene tonometry. CONCLUSIONS: Goldmann applanation tonometry-measured IOP decrease after LASIK is strongy correlated with a decrease in central corneal thickness and changes in keratometry, whereas pressure phosphene tonometry-measured IOP is independent of corneal thickness. Pressure phosphene tonometry appears to be a more reliable method for recording tonometry in these patients.
AB - PURPOSE: To compare pressure phosphene tonometry with Goldmann applanation tonometry for measuring intraocular pressure (IOP) before and after LASIK. METHODS: Forty-three (18 men and 25 women) consecutive healthy patients underwent complete pre- and postoperative LASIK ophthalmologk: assessments including manifest and cycloptegic refraction, keratometry, and central corneal thickness. Three repetitive sets of pressure phosphene tonometry and Goldmann applanation tonometry measurements were performed the day before and 3 months following uneventful LASIK. RESULTS: Mean preoperative spherical equivalent refraction was -4.70±2.50 diopters (D) (range: -1.50 to -12.90 D) and mean preoperative keratometry was 43.95±1.08 D. After LASIK, spherical equivalent refraction was +0.23±0.11 D and mean keratometry was 39.46±2.28 D. Preoperative pressure phosphene tonometry (12.16±1.58 mmHg) and Goldmann applanation tonometry (12.01±1.55 mmHg) IOP measurements were similar. Postoperative IOP was 10.30±1.16 mmHg with Goldmann applanation tonometry and 12.20±1.62 mmHg with pressure phosphene tonometry. The postoperative IOP difference between Goldmann applanation tonometry and pressure phosphene tonometry was 0.15±1.12 mmHg (P=.41). The mean change in pachymetry after LASIK was 68.73±73 μm. The change in Goldmann applanation between preoperative and postoperative LASIK values was 1.71±1.43 mmHg (P<.0001), a change that was strongly correlated with changes in corneal thickness (R=0.75, P<.0001) and keratometry (R=0.72, P<.0001). No such correlations were found with pressure phosphene tonometry. CONCLUSIONS: Goldmann applanation tonometry-measured IOP decrease after LASIK is strongy correlated with a decrease in central corneal thickness and changes in keratometry, whereas pressure phosphene tonometry-measured IOP is independent of corneal thickness. Pressure phosphene tonometry appears to be a more reliable method for recording tonometry in these patients.
UR - http://www.scopus.com/inward/record.url?scp=34247248387&partnerID=8YFLogxK
U2 - 10.3928/1081-597x-20070401-13
DO - 10.3928/1081-597x-20070401-13
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C2 - 17455836
AN - SCOPUS:34247248387
SN - 1081-597X
VL - 23
SP - 405
EP - 409
JO - Journal of Refractive Surgery
JF - Journal of Refractive Surgery
IS - 4
ER -