It seems that you have a developmental (congenital) cataract in one eye for which surgery was performed. Often in long standing cataract, there is partial absorption / fibrosis / calcification & patients often need a second surgical procedure or YAG Laser. Inspite of this, patients may improve poorly due to long standing defect & amblyopia (Lazy Eye). In case you are interested in persuing a career in the defence forces, you may have to be examined as to whether you would meet the visual health criteria. The Ophthalmologist should guide you as to the best course of action & further treatment.