Shooting Sports USA - August 2018 - 32

FEATURE | VISION

head position and stance. The exact final height
position can easily be demonstrated with a
small piece of scotch tape, with the top of the
tape simulating the top of the bifocal segment.
Usually, several repositioning attempts will be
needed before the patient knows what height
would be ideal. This is very important to get
the shooter's feedback.
The final bifocal powers will then need
to be adjusted after taking account of the
different add powers for each eye on the
major part of the lens. For instance, if a +2.25
add would be needed for the bifocal, the add
for the shooting eye and the non-shooting
eye must be subtracted to get the resultant
bifocal powers for each lens.

AR-15 AND RIFLES WITH
REAR APERTURE SIGHTS
By far the most popular rifle that my
shooters bring in for their shooters' exams
are AR-15s using front iron sight posts
with rear apertures, and no scopes. Vision
with the AR-15 rifle is more challenging
because of the different sight radius. The
only way to check vision is through the
aperture onto the front sight post and view
down range. Checking the eyes in the exam
room does not work as well. Please take
some time to review a past article titled
"Visual Disturbances through the aperture,"
especially geared towards older shooters.
I have my shooters place their rifles on
one of the steps of a six foot ladder at a
comfortable height, so the rifle is absolutely
still. Most of the time but not always, the
shooters have their preference of aperture size
in place. At times, we do make a change to see
if a different aperture size makes a difference
in front post and bullseye clarity. Even with

32

AUGUST 2018 | SSUSA.ORG

Dr. Wong proudly stands with Phillip Hemphill (l.) at
Andy's Ice Cream in Port Clinton, OH

the extended depth of field seen through the
aperture, many times the front post clarity is
lacking. It doesn't take much of an add to make
the post clear, and to make the very distant
target blurred. The goal would be to improve
front sight post clarity without affecting target
clarity. Patience would be needed because
as the eye becomes accustomed to the lens
add shown, the eye may fatigue and a slightly
different power may be needed for optimal
performance. It is not uncommon that it comes
down to two final lens choices with one lens
becoming the eventual winner. The testing
cannot be rushed. The first lens that seems to
work best is usually not the final lens. We have
some very astute, serious shooters, and the
slightest change in their shooting lens would
make a big difference during a match.
Wayland wrote, "The lens worked out
great! My up-close vision had been getting
worse and worse over the years, so I needed
something that would bring the front sight into
sharp focus when looking through the micrometer match rear sight on my rifle. Prior to the
new lens, the front sight focus was inconsistent no matter how much I adjusted the iris on
my rear sight, as I was struggling to get a good


https://www.ssusa.org/articles/2017/1/2/visual-disturbances-through-the-aperture/ http://www.SSUSA.ORG

Table of Contents for the Digital Edition of Shooting Sports USA - August 2018

Contents
Shooting Sports USA - August 2018 - Cover1
Shooting Sports USA - August 2018 - Cover2
Shooting Sports USA - August 2018 - 3
Shooting Sports USA - August 2018 - 4
Shooting Sports USA - August 2018 - 5
Shooting Sports USA - August 2018 - Contents
Shooting Sports USA - August 2018 - 7
Shooting Sports USA - August 2018 - 8
Shooting Sports USA - August 2018 - 9
Shooting Sports USA - August 2018 - 10
Shooting Sports USA - August 2018 - 11
Shooting Sports USA - August 2018 - 12
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