Hello dear, The symptoms as mentioned in your post can be due to any pathology in the retina or vitreous humor of eye. So, kindly consult an ophthalmologist & get your eyes checked. Other causes for such symptoms can be: 1. Fatigue due to excessive exercise/running 2. Inadequate hydration status & electrolyte balance of the body 3. Hypoglycemia- decreased blood glucose level 4. Hypotension (deceased blood pressure) 5. Anemia- due to dietary deficiencies of certain nutrients like Iron, Vitamin B 12, Folic acid, etc. which interferes with blood formation. Investigations like complete blood count, estimation of blood pressure & blood sugar levels will be helpful to rule out any pathological cause for the symptoms. Wishing you a Good Health. Please let me know if I need to clarify further. Thanks & take care.