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birdshot retinochoroiditis juvenile idiopathic arthritis hla uveitis spondyloarthopathy weak association strong association transillumination retroillumination principal of illumination principal of compound microscope slit lamp biomicroscopy optical section basic design of slit lamp parts in illumination system sclerotic scatter specular reflection topical oculo-cardiac syndrome local anaesthesia peri-bulbar block retro-bulbar block