<prompt> A 25 year old male presents with painless sudden loss of vision, ocular and systemic examination is not contributory. What is probable diagnosisRetinal detachmentEales diseaseGlaucomaCataract  <response>: Both Eales disease and Retinal detachment are causes of painless sudden loss of vision, however Eales disease is a much more common cause than RD in a young male. Ocular and systemic examinations in both the conditions may be normal. 