From what you describe this is a typical symptom related to any cause resulting in a pulling or stimulation of the retina
in the eye. This can be a posterior vitreous detachment
, vitreous strands tugging a part of the retina or even a vascular cause affecting the retinal blood vessels. Persons with a moderate to high myopic refraction
can experience this more often.
Even though it has not happened again, it would be a good idea to have a detailed retinal eye exam which is done by an ophthalmologist after instilling dilating drops in the eye. Any traction forces in the eye can be easily detected and further treatment, if needed, opined.