Shooting Sports USA - August 2018 - 28

FEATURE | VISION

Computers are essential in our daily lives
and in many fields, including the optical/
ophthalmic field. Many of you may have had
automated instruments determine your eye
health and vision. Can you imagine a $15,000
to $60,000 computer telling the doctor which
Rx you need to see best with, and the doctor
listening? That computerized refraction printout
may sway the doctor's final prescription,
especially during a busy day. My patients
have been very happy to "tell" me which
lenses provide their best vision. My one-onone interactions during the exam have been
important as I developed a sixth sense for their
responses, and I would repeat the lens choices
many times when needed to obtain the final
Rx. With my way of checking eyes, my redo
rate was miniscule, but bear in mind, patients
changing their minds on lens types, materials,
tints and photochromic choices also count into
our redo rate, so it will never be zero percent.

INACCURACIES OF
EYEGLASS PRESCRIPTIONS
I was fascinated when I read Don Nygord's
article on vision and eyeglass prescription,
coming from a perspective outside of the
optical field. Don mentioned that lenses
were rarely made correctly, and he even
had a lensometer to check and verify lenses.
His Nikon lensometer was given to me as a
souvenir, and after evaluating it, I can say
that it was highly sensitive to inaccuracy.
The manager from one of my labs once said
the most accurate and reliable lensometers
are the manual ones. Computerized
lensometers are the norm nowadays and
although they work well, it's difficult to judge

28

AUGUST 2018 | SSUSA.ORG

PHOTO BY USA SHOOTING

TOO MANY COMPUTERS

USA Shooting's Alexis Lagan using an occluder. The
pistol shooter is moving up in the international ranks

the blurriness of a lens when the Rx is off.
With a manual lensometer, I can see the
blurred cross hair images of the instrument.
I once had a prolonged argument with a
lab manager when I sent back a job which
was off. He insisted that the lens was within
tolerance using their "highly sophisticated
computerized instruments," but I knew it
wasn't. Unfortunately, there's a fine line
between quality control and profit margin.
Mistakes do happen. Transferring the Rx
incorrectly from the exam record to the
ordering screen of the lab website, typing +
instead of -, lab technicians pulling out the
wrong lens powers from their inventory,
and making the lens with the astigmatism
cylinder 90 degrees off axis are common.
The final stage of quality control inspections
by the lab is sometimes non-existent, but
it is ultimately the doctor's responsibility
to perform the final inspections. I've seen
first-hand where this was also not done. Too
much dismay, many patients accept what
they received at face value, and would never
question the doctor or staff.


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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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Shooting Sports USA - August 2018 - 14
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Shooting Sports USA - August 2018 - 20
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Shooting Sports USA - August 2018 - 28
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Shooting Sports USA - August 2018 - 47
Shooting Sports USA - August 2018 - 48
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