Distortion of vision query. Then?

Hello doctor From 2 days I am facing vision problem in which straight line appears bent or slanted. A perfect shaped rectangle looks more like a trapezium. I visited advanced eye centre of well known government institution where the opthalmologist checked my eye on priority basis with some kind of binoculars. Then he dilated the pupils and again shined light and checked everything. He told me that everything is looking healthy. What is causing my vision problem then? I am so confused. I do have -0.5 cylinder power in only right eye but I tried covering both eyes one by one and observed that this problem is not limited to any particular eye and is present in both eyes (L and R) regardless. . I also asked doc if I need Oct, he told me everything is normal .