ABSTRACT
Purpose: The study was conducted to determine the ocular pulse amplitude (OPA) changes, measured with a dynamic contour tonometer (DCT), after surgical retinal detachment repair. Methods: This was a prospective and comparative study. Thirty patients (30 eyes) who had undergone uncomplicated unilateral scleral buckling and encircling procedures for quadrant or half?retinal rhegmatogenous retinal detachment were referred for DCT one day before the surgery was performed, on the 1st, 7th, and 30th postoperative day. Methods of descriptive (arithmetical mean, standard deviation) and analytical statistics (analysis of variance) were used to analyze the data and evaluate the significance of the difference. A value of P less than 0.05 was considered statistically significant. The data were evaluated for normality with the single?sample Kolmogorov–Smirnov test. Results: OPA values decreased significantly after scleral buckling procedures (p < 0.0001), but regained near to preoperative values one month after the surgery. Conclusion: OPA tends to decrease after retinal detachment surgery. Restoring patients’ vision with scleral buckling and encircling procedures gives early changes in blood supply to the choroid and ocular nerve, and since OPA is an indirect parameter of choroidal vascularization, measuring these values can help make an insight into ocular hemodynamics.
ABSTRACT
Context: In attempt to find an alternative way to determine conversion from ocular hypertension to primary open angle glaucoma (POAG) (besides visual field and optic disc changes), we analyzed intraocular pressure (IOP) pulse wave in spectral domain. Aims: The aim of this study was to test the potential differences in spectral content of IOP pulse wave between ocular hypertension and POAG patients, which could indicate conversion. Settings and Design: Cross‑sectional study designed to test the differences in the spectral content of pressure pulse wave between nontreated ocular hypertensive and nontreated, freshly diagnosed POAG patients. Methods: The total of 40 eyes of 40 subjects was included: 20 previously untreated ocular hypertensive patients, and 20 previously untreated POAG patients. Continuous IOP measuring gained by dynamic contour tonometry was submitted to fast Fourier transform signal analysis and further statistical data processing. Statistics Analysis Used: Ocular and systemic characteristics of the tested subjects were compared by analysis of variance appropriate for this study design. A P < 0.05 was considered to be statistically significant. Results: Higher spectral components of the IOP pulse wave was discerned up to the fifth harmonic in both of the tested groups. No statistically significant differences were found in any of the tested harmonic amplitudes. Conclusions: There are no differences in the spectral content of IOP pulse wave between ocular hypertensive and primary open angle glaucoma patients which could be indicative for conversion.
ABSTRACT
AIM: To show frequency of progression and progres-sion at the optic disc in primary open angle glaucoma (POAG).METHODS: A total of 33 patients (66 eyes), 14 male and 19 female, aged 14 to 79 with POAG were imaged using the Heidelberg Retina Tomography II (HRT II) three or more times during follow-up periods of 6 years (2000-2006). Disc progression was determined by regression analysis of global and segmental changes in optic disc parameters. Every patient was tested by Octopus G1 once a year. Imaged optic disc parameters with scanning laser tomography were: rim area (ra), cup/disc (C/D), rim volume (rv), mean RNFL thickness (mRNFL). Imaged segments of the optic disc were: global (G), temporal (T), temporal superior (TS), temporal inferior (TI), nasal (N), nasal superior (NS) and nasal inferior (NI).RESULTS: Global frequency of progression according to c/d ratio existed in 34 eyes (51%), but 32 eyes (48%) were without frequency of progression. Progression existed in 12 eyes (18%) in temporal, 7 eyes (10.6%) in temporal superior (TS), 14 eyes (21%) in temporal inferior (TI), 8 eyes (12%) in nasal (N), 7 eyes (10.6%) in nasal superior (NS), and 13 eyes (20%) in nasal inferior (NI) segment. Without progression were 5 eyes (8%).CONCLUSION: Disc progression in our study was mostly in nasal (N) and temporal inferior (TI) segments. Most frequently were stricken temporal inferior (TI) and nasal inferior (NI), but most infrequently nasal superior (NS) segment. Most sensitive parameter was c/d ratio. Segmental scanning is of importance in POAG progression analysis.