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Nathan: after reading your post, I have read up on diffraction ad nauseum. Unfortunately, most of the literature talks about diffraction effects of apertures, though also mentioning that obstacles [e.g., front sight post] also cause diffraction. The only "help" I could find is that in...

Thinking more about the symptoms, my suggestion of refraction cannot be correct, because that requires light going through [not bent around] different density mediums. But perhaps glare, as one poster suggested, is the problem. Distant point sources of intense light, e.g., car headlights at...

Edarnold: approximately ten years ago, I began to have some nasty intraocular floater problems, followed by flashing lights indicative of a retina in the process of detaching. Made a bee line for a retina specialist, who confirmed a loose [but not detached] retina, which he ably repaired with a...

Howard: thanks. I'll drop a line to Bob Jones and see what they say.

rcmodel: thanks. I have something similar from my days in Conventional Pistol competition. It's an adjustable iris that clips onto your eyeglass lens. I'll give it a try.

Taliv: thanks for your reply. I haven't had a physics class in many, many decades, but absorption and refraction are very different things. The latter has to do with bending light, and my theory is that is what is happening, and the front post is the culprit, though somebody expert on optics and...

Am 61 year old hipower M-14 service rifle competitor having progressively increasing vision problems. When looking through rear aperture, front post aligned, but not yet with sight picture, aiming black well above front post, I can see everything reasonably well, including the aiming black. But...