You may be able to better pin it down along sharp contrast lines, maybe moving, or flickering patterns. Eg. a black and white grid, stripes, or small checkerboard pattern on an LCD screen. And of course isolate eyes for these tests.
Your brain can fill in a lot of voids before you notice, especially for monotonous areas and static impressions (as mentioned the blindspot or the blood vessels on your retina are usually "invisible" until you provoke awareness through unusual lighting changes, or defined peripheral accounting experiments). You likely won't notice acquired "blindspots" looking at a white wall, or chaotic fallen leaves on the ground, especially where the other eye provides missing information, but at the edges of highly predictable patterns, one eye closed at a time, you may trick your brain to fuck up, eg. blur or indent otherwise clearly defined areas, when it can't decide which color to fill. Reading texts with on eye closed may also highlight "dancing" letters or distortions around your center of vision.
Worth noting, such defects may be caused by progressive conditions like retina detachment or even ocular melanoma, and the association with laser/light accidents may be incidental. If you spot a spot, do not brush it off as a limited loss! Have it checked, even with a likely attributable cause. You may prevent full blindness through medical intervention in case of disease!
Edit: You can see the blood vessels when you look a white wall and steadily move a (smartphone) flashlight in and out of the field of vision, slowly waving the light next to your head, illuminating from your ears to the side of your nose and consequentially your eyes at a shallow angle. This will cause an unusual blood vessel shadow, now meandering through your vision. The blood vessels are also very visible during eye examinations when the doctor moves the slit lamp around (go check it out ;)
Very weird seeing the insides of the very eye seeing, by ... well ... seeing.
Some of my earliest memories are of these kinds of perception, including the 'phosphenes' caused by internal pressure on the eyes when one looks to the side (they appear as fleeting, roundish flashes). It's curious to me that such formative memories would be triggered by something entirely 'internal' - not a measure of external stimulus involved. Perhaps in a similar way, someone else's earliest memory might be that of becoming aware of their heart beating!
Your brain can fill in a lot of voids before you notice, especially for monotonous areas and static impressions (as mentioned the blindspot or the blood vessels on your retina are usually "invisible" until you provoke awareness through unusual lighting changes, or defined peripheral accounting experiments). You likely won't notice acquired "blindspots" looking at a white wall, or chaotic fallen leaves on the ground, especially where the other eye provides missing information, but at the edges of highly predictable patterns, one eye closed at a time, you may trick your brain to fuck up, eg. blur or indent otherwise clearly defined areas, when it can't decide which color to fill. Reading texts with on eye closed may also highlight "dancing" letters or distortions around your center of vision.
Worth noting, such defects may be caused by progressive conditions like retina detachment or even ocular melanoma, and the association with laser/light accidents may be incidental. If you spot a spot, do not brush it off as a limited loss! Have it checked, even with a likely attributable cause. You may prevent full blindness through medical intervention in case of disease!
Edit: You can see the blood vessels when you look a white wall and steadily move a (smartphone) flashlight in and out of the field of vision, slowly waving the light next to your head, illuminating from your ears to the side of your nose and consequentially your eyes at a shallow angle. This will cause an unusual blood vessel shadow, now meandering through your vision. The blood vessels are also very visible during eye examinations when the doctor moves the slit lamp around (go check it out ;)
Very weird seeing the insides of the very eye seeing, by ... well ... seeing.