AIM: To investigate the effect of simulated dynamic intraocular pressure (SDIOP) during uncomplicated phacoemulsification on postoperative macular and peripapillary retinal nerve fiber layer (RNFL) thickness. METHODS: Macular and RNFL thicknesses in one eye of patients (n=30) undergoing uncomplicated phacoemulsification were measured by optical coherence tomography preoperatively and 1 week postoperatively. The best-corrected visual acuity, SDIOP, irrigation time (IT), effective phacoemulsification time, entire surgical duration, blood pressure, and heart rate were recorded. RESULTS: The mean SDIOP and IT was (74.9 ± 27.4)cmH(2)O and (178.4 ± 21.6) seconds respectively. We divided our patients into two groups based upon IT with greater than 90cmH(2)O (P(>90)IT). In Group A (n=14), the P(>90)IT was greater than the mean P(>90)IT, and in Group B (n=16), the P(>90)IT was less than the mean P(>90)IT. For all patients there was a significant increase in macular thickness one week after cataract surgery (P=0.001). While the RNFL thickness tended to increase, the change was not significant. The postoperative macular thickness of Group A, (277.8 ± 13.7)µm, was significantly thicker than that of Group B, (267.9 ± 15.0)µm (P=0.004). The postoperative peripapillary RNFL thickness of Group A, (96.8 ± 10.8) µm, was not significantly different from Group B. For Group A, the change in macular thickness was positively correlated with P(>90)IT (R(2)=0.524, P=0.02). There was no statistical difference in postoperative visual acuity between Groups A and B. CONCLUSION: After uncomplicated phacoemulsification, increased macular thickness is associated with the IT under high SDIOP. The effect of high SDIOP is limited to the sub-clinical level.
AIM: To investigate the effect of simulated dynamic intraocular pressure (SDIOP) during uncomplicated phacoemulsification on postoperative macular and peripapillary retinal nerve fiber layer (RNFL) thickness. METHODS: Macular and RNFL thicknesses in one eye of patients (n=30) undergoing uncomplicated phacoemulsification were measured by optical coherence tomography preoperatively and 1 week postoperatively. The best-corrected visual acuity, SDIOP, irrigation time (IT), effective phacoemulsification time, entire surgical duration, blood pressure, and heart rate were recorded. RESULTS: The mean SDIOP and IT was (74.9 ± 27.4)cmH(2)O and (178.4 ± 21.6) seconds respectively. We divided our patients into two groups based upon IT with greater than 90cmH(2)O (P(>90)IT). In Group A (n=14), the P(>90)IT was greater than the mean P(>90)IT, and in Group B (n=16), the P(>90)IT was less than the mean P(>90)IT. For all patients there was a significant increase in macular thickness one week after cataract surgery (P=0.001). While the RNFL thickness tended to increase, the change was not significant. The postoperative macular thickness of Group A, (277.8 ± 13.7)µm, was significantly thicker than that of Group B, (267.9 ± 15.0)µm (P=0.004). The postoperative peripapillary RNFL thickness of Group A, (96.8 ± 10.8) µm, was not significantly different from Group B. For Group A, the change in macular thickness was positively correlated with P(>90)IT (R(2)=0.524, P=0.02). There was no statistical difference in postoperative visual acuity between Groups A and B. CONCLUSION: After uncomplicated phacoemulsification, increased macular thickness is associated with the IT under high SDIOP. The effect of high SDIOP is limited to the sub-clinical level.
Authors: H A Quigley; S J McKinnon; D J Zack; M E Pease; L A Kerrigan-Baumrind; D F Kerrigan; R S Mitchell Journal: Invest Ophthalmol Vis Sci Date: 2000-10 Impact factor: 4.799
Authors: W J Stark; A E Maumenee; W Fagadau; M Datiles; C C Baker; D Worthen; P Klein; C Auer Journal: Surv Ophthalmol Date: 1984-05 Impact factor: 6.048