Optic neuritis – photopsia on eye movement, retrobulbar pain.A study assessing the accuracy of bedside ocular ultrasonography in 61 patients in an emergency department showed a sensitivity of 100% and a specificity of 83–97.2%. General practitioners in rural areas may have limited access to an ophthalmologist hence those with experience in ultrasonography may be able to determine the presence or absence of ocular pathology. Dilating eye drops take 10–15 minutes to take effect and as there is a small risk of triggering acute-angle closure glaucoma, pupil dilation is not ideal in a general practice setting.
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