iCliniq logo

Ask a Doctor Online Now

HomeAnswersOphthalmology (Eye Care)posterior vitreous detachmentWhy is there a flash of light when I see side to side?

What is causing a flash while seeing side to side?

What is causing a flash while seeing side to side?

The following is an actual conversation between an iCliniq user and a doctor that has been reviewed and published as a Premium Q&A.

Medically reviewed by

Dr. Divya Banu M

Published At April 20, 2019
Reviewed AtFebruary 15, 2024

Patient's Query

Hello doctor,

I have an odd thing happening in my left eye. I see a flash of light when I look right to left in the left side of my eye. It is a curve from top to bottom. It happens in daylight, nighttime, and even in the dark with my eyes closed. I move my pupil left to right and see a bright arc of light. I cannot make it stay there, it just flashes as I move my eye balls left to right. Any ideas?


Welcome to icliniq.com.

This occurrence of flashes of light can be due to various causes. The first and the most probable cause could be posterior vitreous detachment, this is a benign condition not requiring any treatment. Here, you may experience some floaters but no reduction in vision or nonseeing areas in your visual field. The most important to rule out here would be the second condition, retinal detachment. Here, although you do experience floaters just like in posterior vitreous detachment, the floaters are more numerous and keep increasing with time. You will also have a reduction in vision with nonseeing areas in your visual field. This often needs to be treated surgically. I recommend you to visit an ophthalmologist. In case there is no reduction of vision or increase in floaters, I would not say that it is not urgent.

Same symptoms don't mean you have the same problem. Consult a doctor now!

Dr. Manjunath Natarajan
Dr. Manjunath Natarajan

Ophthalmology (Eye Care)

Community Banner Mobile
By subscribing, I agree to iCliniq's Terms & Privacy Policy.

Ask your health query to a doctor online

Ophthalmology (Eye Care)

*guaranteed answer within 4 hours

Disclaimer: No content published on this website is intended to be a substitute for professional medical diagnosis, advice or treatment by a trained physician. Seek advice from your physician or other qualified healthcare providers with questions you may have regarding your symptoms and medical condition for a complete medical diagnosis. Do not delay or disregard seeking professional medical advice because of something you have read on this website. Read our Editorial Process to know how we create content for health articles and queries.

This website uses cookies to ensure you get the best experience on our website. iCliniq privacy policy