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Alinne M. Costa, Sebastião Cronemberger; Optic Disc And Retinal Nerve Fiber Layer Thickness Descriptive Analysis In Megalopapilla. Invest. Ophthalmol. Vis. Sci. 2012;53(14):673.
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To evaluate the optic disc and retinal nerve fiber layer (RNFL) thickness in megalopapilla cases by confocal scanning laser ophthalmoscopy (CSLO) and Stratus optical coherence tomography (OCT). To assess the importance of these measurements in diagnosing megalopapilla.
This study included 59 eyes (30 patients) diagnosed as megalopapilla. All subjects underwent a complete ophthalmic examination that included intraocular pressure (IOP) and central corneal thickness (CCT) measurements and standard automated perimetry (SAP) using the Swedish Interactive Threshold Algorithm (SITA) and the 24-2 program (Humphrey Field Analyzer; Carl Zeiss Meditec, Inc., Dublin, CA). CSLO examinations were performed with the Heidelberg Retina Tomograph (HRTII-Heidelberg Engineering, Germany). Thickness of the RNFL around the optic disc was measured with Stratus OCT, version 4.0.1 (Stratus OCT; Carl Zeiss Meditec). A descriptive analysis was made using SPSS (version 12.0; SPSS Inc, Chicago, IL) statistical software.
The mean global optic disc area for all eyes with megalopapilla was 3.28±0.53 mm² and was not statistically different among races (P≥0.159) or sex (P≥0.108). The average RNFL thickness was 102.5±12.68 μm. Pattern standard deviation was 3.8±2.4 and mean deviation was -1.22±2.65. CCT mean value was 543±35.9 μm. IOP measurements ranged from 10.0 to 20.6 mmHg (14.4±2.7).
In megalopapilla the optic disc is abnormally large. The RNFL thickness is normal. These findings are essential for distinguishing megallopapilla from the optic glaucomatous neuropathy.
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