Thank you for the reply and additional information.
If the black spot were to be a floating one , it would have suggested a posterior vitreous
detachment(PVD). In this condition the thick gel at the back of the eye gets detached from its surrounding retina and clumps to the centre of the eye. During this event it may give rise to various eye symptoms like flashes of light
and floaters( which can vary as wavy lines/spots/circles etc). It is a harmless condition and does not require any intervention or treatment. As a precautionary measure a routine retina test needs to be performed just to check for the intactness of the retina. Very rarely the retinal traction may induce tiny retinal holes or tears which if found can be sealed with lasers. But a sudden shower of spots can indicate a retinal detachment
which is heralded by presence of a shadow or veil or curtain in the field of vision , thus requiring urgent treatment.
If you feel that the black spot is unlike the above picture and is definitely fixed in the visual field and moves in the same direction as the eye moves, then it does require further evaluation with visual field analysis by perimetry. If you have never been evaluated for glaucoma then a preliminary eye check up becomes mandatory. In glaucoma , as the intraocular
pressure rises it kind of puts pressure on the optic nerve and results in corresponding visual field defects. A small black spot which is fixed , can be an early change ( it is very rare to get an enlarged blind spot without any cause) seen in glaucoma. Depending on how the black spot behaves in the next few days, you can get an appointment for an eye check up for intraocular pressure recording, perimetry and fundus examination for retinal evaluation. If PVD is confirmed then there is no further treatment required.
Please feel free to ask follow up questions( if any).
Thank you and best wishes
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A bonus and positive feedback are welcome.Views expressed are for information purpose only and cannot substitute a visit to an ophthalmologist