<prompt> Campimetry is used to measure:Visual fieldPattern of retinaMalignant melanomaSquint  <response>: Campimetry scotometry- it is useful to evaluate the central and paracentral area 30deg of the visual field. For it, the Bjerrums screen is used .of either l metre or 2 metres square Patient is seated at a distance of 1 metre for 1m Bjerrum Screen or 2 metres for 2m Bjerrum Screen The patient fixates at the central dot with one eye, the other being occluded. A white target 1-10 mm diameter is brought in from the periphery towards the centre in various meridians. Initially the physiologic blind spot is chaed, any disooion malalignment of blind spot from normal limits can be detected For instance ,Centralparacentral scotomas can be found in optic neuritis and open angle glaucoma. 