Ocutech VES Mini Assembly instructions

Ocutech VES
®
Mini
(Vision Enhancing System)
Fitting Guide
1. How to demonstrate the system:
The Ocutech VES®Mini is available in a demonstrator kit
that uses a special adjustable frame. The kit can be ordered
with one or two telescopes, though binocular demonstration
is not recommended as the demonstrator frame mountings
are not sturdy enough to maintain proper alignment. The
two-telescope demonstrator kit is suggested as it allows for
testing the system for either the right or left eye without
having to disassemble the diagnostic telescope mounting.
When using the demonstrator frame, you can control the
height of the telescope by raising and lowering the bridge
piece. You can slide the telescope right and left to position
the eyepiece directly above the pupil of the eye chosen to
sight through the device. Confirm that the patient can see a
full, round field through the telescope, and that the image
is not cut-off to the right or left, or up or down. You may
even want to allow the patient to slide the telescope slightly
right or left themselves to position it best.
Once the position is finalized, remove the frame and
measure the distance between the center of the eyepiece
and the center of the bridge to determine the proper PD for ordering the telescope system.
Focusing is accomplished by rotating the ring at the very front of the telescope. Patients occasionally try to
turn the entire telescope to focus, rather than turning just the front ring. Warn them to NOT force the focus,
as this may break the device. Do NOT use the PD markings on top of the demo frame.
2. Indoctrinating the patient:
Once you have positioned the VES®Mini properly, have the patient switch their fixation in and out of the
telescope eyepiece until they get comfortable with the action. Demonstrate how to focus the device for
different distances.
Remind the patient that the VES®Mini enlarges images three times and as a result they should be able to
see targets three times further away than with their “normal” vision. Because of the “tunnel vision” field of
view, they will need to learn to switch their attention from the regular lens (to find the target), to the
telescope eyepiece (to see the target). They should practice this until they become comfortable and proficient.
When looking at closer distances, they should be able to see print or items that are three times smaller than
possible with their normal vision. Due to the shallow depth of field of telescopes at near, the patient can
either move their head in and out to maintain clear vision at different distances or re-focus the device to
maintain a clear image.
Demonstrator frame
with one telescope installed.
Focusing Ring
© OCUTECH
© OCUTECH

Ocutech VES
®
Mini Fitting Guide
3. Prescribing and ordering the patient’s system:
The VES®Mini can be prescribed monocularly, binocularly and for distance or near.
You must determine the proper eye (if a monocular order) to use the device, the proper
size frame and temples (we suggest sturdy metal frames with adjustable nosepads and
slightly longer temples for more holding power), and the appropriate carrier lens
prescription for the eyeglasses (which can be either single vision or bifocal – we do not
recommend trifocals or progressive lenses for use with this device). In high
prescriptions, remember to use the smallest frame possible. The VES®Mini can
accommodate correction of refractive errors between +12 and -12 diopters by simply
focusing the telescope. Eyepiece corrections for higher refractive errors and for astigmatism are available by a special-order
cap that fits over the back of the telescope eyepiece. Accessories include lens caps for the front of the telescope that can
hold either filters or reading cap powers and slip-behind sunfilters in several colors. Reading caps should be considered if
closer working distances are required than that provided solely by focusing the telescope itself.
4. Determining the proper positioning of the VES
®
Mini:
The bottom of the eyepiece should be positioned to line up at the top of the pupil
or the bottom of the upper lid, whichever is lower.
The telescope should be angled upward, so that when the patient dips their head
down to sight through the telescope their line of sight is parallel to and directly
through the telescope. The higher the telescope sits on the head, the greater the
downward tilt of the head will be required to sight through the telescope, and the
greater the upward angle of the telescope must be. Try to fit the telescope as low
as possible to minimize the angle.
For distance use, the telescope is positioned at the user’s monocular pupillary
distance (PD) and usually inclined upward 10 degrees. The centers of the tele-
scope eyepiece(s) are usually positioned 10mm below the top of the eyeglass lens.
For near, the telescopes are positioned at the monocular near PD for binocular
systems. Several methods are available to determine an accurate near PD
measurement. For binocular systems, a near working distance must be provided so
that the convergence of the two telescopes can be preset. If a monocular near
device is prescribed, no convergence is required. Near telescopes are usually
inclined downward 18 degrees. The centers of near telescopes are usually
positioned 15 mm above the bottom of the eyeglass lens.
To confirm proper positioning and to specify positioning other than the standards described above, we recommend
that you mark the location of the pupil on each carrier lens.
Use the step-by-step ordering form to insure that you have answered all questions, and feel free to call Ocutech consultations for support.
The bottom of the eyepiece should
be positioned at the top of the pupil
The telescope is positioned at an
upward angle so the user can
view normally beneath it
Simply drop the head and look into
the eyepiece to sight through
the telescope
109 Conner Drive, Suite 2105, Chapel Hill, NC 27514 USA
[phone] • [phone] • Fax: [phone]
[email protected] • www.ocutech.com
®
Effective August 2010
© OCUTECH
© OCUTECH
© OCUTECH