This is an important consideration when using a classic telescope where, of course, you only use one eye. And as astronomers acclimate to using their equipment and start going for more challenging deep sky, one learns to use averted vision, so to accommodate for the blind spot in a single eye.
The image is for my left eye, the one I normally use on the ocular. I could not see the blinking dot down (slightly) and left of centre.
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