TargetTalk

I use "Knoblok" shooting glasses whilst shooting smallbore prone. There seems to be different ideas as to how one chooses the correct lens.

Can anybody give me and my optician any assistance?

Go to the Knobloch web site and select the option for refraction http://www.knobloch-schiessbrillen.de/r ... start.html

For a rifle shooter you're generally seeing the distant vision prescription adjusted for the slightly longer than usual distance from lens to eye.

OK
I'll jump in...

Get the focus set for the distance to the foresight (get into the position and get someone to measure this for you), but also note:

- the position YOU use for prone is important. The lens should be positioned so that it is perpendicular to YOUR line of sight in the prone position, with you looking through the centre of the lens. To get this perpendicular / central position, many shooters have the lens positioned further from the eye than would be normal for 'ordinary' glasses - this will change the optic correction used for you.
So you will need the distance fom the eye to the lens, and the lens to the front sight.

- if there is ANY spherical correcttion for astigmatism, have the optician mark the lens so you know which is the top (so you can pick up any misalignment if the lens gets loose in the holder).

- go for the clearest lens material your optician can get. For shooting glasses that will not be subject to the day-to-day abuse that normal glasses get, you can trade off scratch resistance for transmissibility.

- (for 50m prone) I would recommend forgetting the temptation to get a tinted lens

Enjoy,

Spencer C