Double vision in single eye and ghosting
I’m 22 years old and have 20/20 vision. During the morning and daytime, my vision is mostly normal. However, in the evening or when watching TV in a dark room, I notice ghosting around distant subtitles or bright objects.
I tested this with a distant streetlight. With both eyes open, the light looks normal. But when I close my left eye and look only through my right eye, the streetlight appears as one main light with a second, fainter light attached above it, along with a ray/streak extending in the same direction.
I also have dry eyes, but blinking or using artificial tears doesn't completely remove the ghosting. Interestingly, when I look through a pinhole with my right eye, the ghost image completely disappears.
Has anyone experienced something similar, particularly around streetlights or subtitles at night? Can this happen with ordinary astigmatism even if visual acuity is 20/20? And approximately how much astigmatism (cylinder power) can cause a streetlight to appear as two lights? Could irregular astigmatism or keratoconus produce this pattern?