Vitreous Detachment

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Posterior vitreous detachment is a common condition that affects people over the age of 50. It is when the vitreous gel that fills the eye separates from the retina.

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Some don’t notice it at first, but it can cause increased floaters (dark spots that float across visual field) due to strands of the vitreous humor casting shadows on the retina. Some may also experience flashes of light in the peripheral vision and possible blindness due to retinal detachment that can occur.

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How is it diagnosed?

Usually, a dilated eye examination is used to diagnose this condition and additional optical coherence tomography can be used to further and more clearly visualize and diagnose.

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This condition is usually non-sight-threatening thought, and symptoms subside in the vast majority of patients as the fluid replenishes itself. 

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https://www.asrs.org/patients/retinal-diseases/9/posterior-vitreous-detachment 

https://www.nei.nih.gov/learn-about-eye-health/eye-conditions-and-diseases/vitreous-detachment