PLUSOPTIX S16 How to use

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Vision Screener
Short Manual 11
“HOTV critical line testing”
Plusoptix GmbH
Nordostpark 21
90411 Nuremberg
Germany
www.plusoptix.com
Edition: 10/16/2020

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Table of Contents
1Intended use....................................................................................................................3
2Starting the HOTV critical line testing feature ..................................................................3
3Test Preparation..............................................................................................................4
4Test Procedure................................................................................................................5
5Alignment........................................................................................................................5
6Children who did not pass the test...................................................................................5
7HOTV Matching Card (20/80 size from 10 Ft)..................................................................6
List of figures
Figure 1: Start Screen ........................................................................................................... 3
Figure 2: HOTV test screen................................................................................................... 4
This manual is a supplementary short manual. For important information about your
Plusoptix device, such as its intended use, basic handling, technical information,
maintenance, service, and warranty information, please refer to the user manual that
was delivered with your device. This user manual can also be downloaded on our
homepage (plusoptix.com), under support.
List of further supplementary short manuals
1. Checking scope of delivery and learning about the device
2. Adjusting settings and setting up WLAN
3. Preparing and performing a measurement
4. Viewing the measurement results
5. Entering, retrieving or deleting patient data
6. Documenting measurement results electronically
7. Documenting measurement results on paper
8. Exporting back-ups and reports (only plusoptiX S12C and S16)
9. Downloading software updates
10. Troubleshooting malfunctions and measuring interruptions
11. HOTV critical line testing (only plusoptiX S12C, S12R & S16 in the US)

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1 Intended use
The Plusoptix HOTV critical line testing feature is designed to facilitate the performance of a
distance visual acuity test in children age 5 and older according to the 2016 AAP Vision
Screening Guidelines.
The combination of a critical line distance visual acuity test with instrument-based vision
screening can save valuable exam time and improve overall sensitivity as well as specificity
of vision screening.
For the sake of time saving, instrument-based vision screening is conducted first:
Children with a “refer” screening result are referred to an eye care professional for a follow-
up exam. It is not necessary to spend additional time screening for distance visual acuity.
Children with a “pass” screening result have no significant refractive error. Nevertheless, it is
necessary to check their visual acuity in a second step. Distance visual acuity screening
does not need to start with the largest optotypes (here: H, O, T and V). The age appropriate
critical line can be presented.
If a child reads 4 out of 5 presented letters with each eye correctly, the child passes the
critical line visual acuity test based on 20/32. A referral and follow-up exam is only needed if
a child is not able to read 4 out of 5 letters with each eye.
The Plusoptix HOTV critical line testing feature works on all built-in touchscreens of
the current Plusoptix Vision Screeners. This feature is not designed to be used on
an external monitor (S16 only).
2 Starting the HOTV critical line testing feature
You can start the HOTV critical line testing feature by touching the HOTV icon above the
navigation bar on your main screen.
Figure 1: Start Screen
HOTV icon

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A random choice of 5 letters (chosen from H, O, T or V) will appear on the screen. By
touching the screen you will automatically return to the start screen (see above). Once you
touch the HOTV icon (1) again, a new random choice of 5 letters will appear on the screen.
3 Test Preparation
Choose a well-lit room, preferably with natural light. The room should be free from glare and
without distractions, such as other children, pictures, toys or noise. Mark off 10 feet. The line
may be marked on the floor to make sure the child is at the right distance.
The child may sit or stand. If the child sits, make sure the back of the chair is on the line so
the back of the child´s head lines up with the tape on the floor. If the child is standing, make
sure the child is standing with the back of his or her heels on the mark. The child should not
lean their torso or head forward.
If the child usually wears glasses or contact lenses, the test should be conducted while
wearing the vision aid. Make a respective note on your screening report.
Hint:
Always start with the same eye to avoid recording errors.
Hint:
HOTV matching cards can be used by children unable to identify their letters to
help them perform the test. Find an HOTV matching card template on page 6 of 6.
Figure 2: HOTV test screen

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4 Test Procedure
a. Make sure patches or occluders are placed correctly for screening each eye
independently.
b. Touch HOTV icon
c. Tell the child to keep both eyes open and read or match (if using HOTV matching
cards) the critical line of letters with the uncovered eye. Observe the child and make
sure he or she is not peeking, squinting or tilting their head.
d. If the child is able to read at least 4 out of 5 letters of the critical line (20/32), the test
has been passed with the respective eye. If the child is not able to read at least 4 out
of 5 letters of the critical line, the test has not been passed with the respective eye.
e. Record your results.
f. Touch the screen to go back to the main screen.
g. Start over with the other eye.
5 Alignment
Turn the device around after touching the HOTV icon and hold it in such a way that the
screen faces the child vertically. The screen has to be at the child's eye level at all times.
Make sure the HOTV interface can be seen completely without interference, such as fingers
covering part of the screen.
6 Children who did not pass the test
It is recommended to refer any child who did not pass the critical line test with either one or
both eyes to an eye care professional for a comprehensive eye examination.