In patients with anterior uveitis, decrease in vision due to posterior segment involvement can occur because of -
Posterior involvement is changes in the vitreous and retina: Exudates and inflammatory cells may be seen in the anterior vitreous after an attack of acute iridocyclitis. Cystoid macular edema(CME) may occur, specially in the chronic iridocyclitis.
Visual floaters
Inflammatory disc edema
Exudative retinal detachment
CME
Uveal tract