This study aimed to assess the correlation between visual field changes and optical coherence tomography (OCT) angiography changes of retinal nerve fiber layer in patients with primary open angle glaucoma.
Glaucoma is the leading cause of irreversible blindness worldwide. Since glaucomatous damage is preventable but irreversible, an early diagnosis and close follow-up of glaucoma patients are primordial. Optical coherence tomography angiography (OCTA) is a recently developed, noninvasive imaging modality that detects blood flow through the motion contrast generated by red blood cells. Currently, there are 2 groups of complementary exams used for the diagnosis and follow-up of glaucoma patients: structural (where OCT has a considerable role) and functional (visual field) optic nerve measurements, Both technologies have strengths and limitations. A new technology for diagnosis and follow-up that can avoid the limitations summarized above is lacking. OCTA seems to be a good candidate for such a role, OCT can detect the Doppler frequency shift of the backscattered light that provides information on blood flow.
Study Type
OBSERVATIONAL
Enrollment
100
Patients had intraocular pressure (IOP)\>21 mmHg.
Patients without family history of primary open-angle glaucoma (POAG), IOP ˂21mm Hg.
Assiut university
Asyut, Egypt
Peripapillary vessel density (PpVD)
Peripapillary vessel density (PpVD) was examined with swept-source OCT(DRI OCT Triton;Topcon Corporation,Tokyo,Japan) after pupillary dilatation , using an optic disc scan , peripapillary vessel density was derived from the images acquired with a 6 mm x6 mm mm field of view centered on the optic disc. PpVD measurements were calculated within the RNFL in a slab from the internal limiting membrane (ILM) to the RNFL posterior boundary.
Time frame: 12 months post-procedure
Pattern standard deviation (PSD)
Pattern standard deviation ( PSD) on Visual field test was performed with the Swedish Interactive Threshold Algorithm (SITA) Standard strategy program 24-2 of the octopus polar analysis which measures 24 degrees temporally and 30 degrees nasally and test 54 points.
Time frame: 12 months post-procedure
Mean deviation (MD)
Mean deviation(MD) on Visual field test was performed with the Swedish Interactive Threshold Algorithm (SITA) Standard strategy program 24-2 of the octopus polar analysis which measures 24 degrees temporally and 30 degrees nasally and test 54 points.
Time frame: 12 months post-procedure
The thickness of the peripapillary retinal nerve fiber layer(RNFL)
The thickness of the peripapillary retinal nerve fiber layer(RNFL) was obtained from a circle with a diameter of 3.4 mm centered on the optic disc. The RNFL thickness in 4 quadrants and 12 clock-hour were obtained by using the built-in automated segmentation algorism of the system.
Time frame: 12 months post-procedure
Intraocular pressure (IOP)
Intraocular pressure (IOP) was recorded.
Time frame: 12 months post-procedure
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