As i rotate the
finger it gets narrower, and at 180 degree (or if i look under the
finger) there is a blurry band instead. I assume this confirms there is some astigmatism, and also indicates the axis? My theory is the edge of the finger obstructs the light going to the area of the eye which has the picture out of place due to astigmatism, thus i see more clearly in that narrow band, is that correct?