I don't know the mechanics, . . . but it is not always the eyes.
I saw a unit at a gun show, . . . it was crisp, clear, clean, . . . and there was only one $400.00 reason I didn't buy it that day.
Later on, I saw one by the same mfg, . . . that looked like a small bush fire when you tried to look through it. I would not have bought that one for $5.
There are differences, . . .
May God bless,
Dwight
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www.dwightsgunleather.com
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