<prompt> Earliest field defect in open angle glaucoma is -Contraction of the all isoptersEnlarged blind spotNasal tipArcuate scotoma  <response>: Field defect in the order of appearance Isopter contractionBaring of blind spotsmall wing shaped paracentral scotomasiedels scotomaArcuate or Bjerrums scotomaRing or double arcuate scotomaRoennes central nasal stepperipheral field defectsAdvanced glaucomatous field defects. Ref :Ophthalmology A K Khurana 6th edition chapter-10 page no :233 