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RNFL asymmetry has been proposed as a strong indicator of optic neuritis, [7] [8] with one small study proposing that asymmetry of 5–6μm was "a robust structural threshold for identifying the presence of a unilateral optic nerve lesion in MS." [9] Optic neuritis is often associated with multiple sclerosis, and RNFL data may indicate the pace ...
ONH Optic nerve head Oph Ophthalmoscopy OS oculus sinister (left eye) OU oculus uterque (both eyes) PD Pupillary distance PERRLA Pupils equal, round, reactive to light and accommodation PH Pinhole see Pinhole occluder and Visual_acuity#Legal_definitions: PHNI Pinhole No Improvement see Pinhole occluder and Visual_acuity#Legal_definitions: PHVA
The RNFL isn't the only form-birefringent structure in the eye. Anterior segment structures, such as the cornea, also phase-shift polarized light. So the latest instrument includes a compensating device or compensating corneal which is designed to remove the portion of the signal generated by the anterior segment.
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Óglaigh na hÉireann (pronounced [ˈoːɡl̪ˠiː n̪ˠə ˈheːɾʲən̪ˠ]; ONH) is a small dissident Irish republican paramilitary group that took part in the dissident Irish republican campaign. The organisation started carrying out attacks around 2009 and was formed after a split within the Real IRA , led by Seamus McGrane .
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A meta-analysis published in 2009 found that people with primary open angle glaucoma do not have increased mortality rates, or increased risk of cardiovascular death. [ 18 ] A 2024 JAMA Ophthalmology reports that in 2022 an estimated 4.22 million people in the U.S. had glaucoma, with 1.49 million experiencing vision impairment due to the ...
Layers of protection analysis (LOPA) is a technique for evaluating the hazards, risks and layers of protection associated with a system, such as a chemical process plant. . In terms of complexity and rigour LOPA lies between qualitative techniques such as hazard and operability studies (HAZOP) and quantitative techniques such as fault trees and event trees.