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1. Hess Chart
Ravi Parkash ( B.Optom )
Organized Secretary of VCOO
Vision Congress of Optometry
Core Committee Member Jabalpur Optometry Division

3. HESS CHART SCREEN PLAT
/ BOARD DETAIL
The Hess Chart Screen is a Metal Plate
95cm Wide and 95cm High . Include 24
Squares ,12 Inner and 12 in Outer filed .
The Central filed 15 Degree while , while
Outer filed limited 30 Degree. Each square
on Chart indicates 5 Degree.

4. HESS CHART SCREEN DESIGNED BY
• The Hess screen test was designed by
Walter Rudolf Hess in 1908 with
subsequent modifications. Hess was a
famous neurophysiologist who was
awarded the Nobel Prize in 1949 for his
research into the functional
organization of the vegetative nervous
system .

5. WHAT IS MEANING OF HESS
CHART
• The Hess screen test is based on the
haploscopic principle . A black
tangent screen for measuring and
classifying strabismus. It consists of
a chart divided by red lines into
small sections of 5º .

6. HOW TO OPERRATE HESS
CHART MACHINE
1.Test is performed with each eye
Fixating in trun.
2.It is done at 50 cm.
3.Patient wear Red and Green gls.
4.Eye to be tested should have
Green glass board with small red
lights.
5.Patient is asked to place Green
light in each of points on red light
as illuminated .

7. RED /GREEN GLASSES USE IN HESS CHART
WHY ??
Patient is asked to place Green light in each of
points on red light as illuminated .
• WHEN RED LIGHT CONTROLED BY EXAMINER.
• EYE UNDER RED GOGGLE ACTS AS THE FIXING
EYE.
• EYE UNDER GREEN GOGGLE ACTS AS THE
INDICATOR EYE.

8. DOCTORS PRECRIBE HESS CHART TEST BUT
WHY ?

9. DIAGNOSIS OF
1.Under Action or Over Action of EOM
2.Mechanical or Neurogenic Palsy
3.Congenital/Long Standing or Acquired
Pals
4.A or V Pattern