Looking at bright light for better focus on front sight

Seamaster · Post by **Seamaster** » Wed Aug 26, 2009 9:14 pm

I had a very hard time lately on seeing the front sight clearly, despite proper addition of +0.75.

When I confronted my ophthalmology friend about my shooting problem, he said, "Oh, that is simple to solve".

He said, "Just look at some place slightly brighter to constrict your pupil before you shoot, the pupil will constrict, and you will be able to see the front sight clearly."

I thought this is too good, and too simple. So I tried.

Eureka, it worked !!

Any of you older folks with similar experience?

RobStubbs · Post by **RobStubbs** » Thu Aug 27, 2009 1:41 am

It's only a fleeting pupil constriction, your eye opens back up again typically in about a second - try looking in a mirror and covering the eye then opening it again.

I don't quite understand the point of the 'experiment' and what it's trying to prove. It appears like it's trying to close the pupil down and thereby increasing depth of field. But if that works it suggests the prescription is wrong in the first place.

That aside it's not really a routine you want to get into during a shooting competion - and of course you have to rely on there being something significantly brighter to look at.

Rob.

Gwhite · Post by **Gwhite** » Thu Aug 27, 2009 6:00 pm

I shoot in an indoor bullseye league, and the lighting in a lot of the older ranges is pretty dim, especially at the firing line. I've thought about using a headlight to illuminate my sights better. Now my eyes are old enough that I've wimped out & gone to a red dot. For the occasional indoor international match, I've often wondered what the rules are about bringing your own extra illumination.

They now make some very small, bright LED headlights that would easily last through a match.

You could also shine it in your face to get your pupil to constrict, but I think that is basically no different than using an aperture (which needs no batteries & is clearly legal).

RobStubbs · Post by **RobStubbs** » Fri Aug 28, 2009 1:48 am

Gwhite wrote:I shoot in an indoor bullseye league, and the lighting in a lot of the older ranges is pretty dim, especially at the firing line. I've thought about using a headlight to illuminate my sights better. Now my eyes are old enough that I've wimped out & gone to a red dot. For the occasional indoor international match, I've often wondered what the rules are about bringing your own extra illumination.

They now make some very small, bright LED headlights that would easily last through a match.

You could also shine it in your face to get your pupil to constrict, but I think that is basically no different than using an aperture (which needs no batteries & is clearly legal).

There are rules about range lighting so rather than taking a head torch, try asking about getting the range upgraded.

I can't think of any specific rules the would cover headtorches but then to be ISSF compliant a range would be relatively well lit (all over).

Rob.

Spencer · Post by **Spencer** » Fri Aug 28, 2009 4:43 am

RobStubbs wrote:...I can't think of any specific rules the would cover headtorches ...
Rob.

doubt that it would take long for 8.6.7 to come in to play

Spencer

RobStubbs · Post by **RobStubbs** » Fri Aug 28, 2009 8:05 am

Spencer wrote:
RobStubbs wrote:...I can't think of any specific rules the would cover headtorches ...
Rob.
doubt that it would take long for 8.6.7 to come in to play

Spencer

Really ?, I can't think of any LED torches that would give enough light to cause a disturbance to their neighbours. But as I pointed out above, if we're talking about events under ISSF rules, then lack of light wouldn't be an issue in the first place (6.3.17)

Rob.