Brief introduction on Amsler Chart, procedure,types of chart check youtube channel for optometry videos

1. ananta poudel
B.optom. NAMS, bir hospital
1st batch

2. Amsler chart
 Amsler chart is a set of 7 charts (10x10 cm, each squars 5 mm) use
to detect small anomalies (around 1°)in the central VF that could
remain undetected by the usual method of VF testing.
 Indication of amsler chart:
 1)Suspected macular diseases
 2) Unexplained visual loss
 3)Questionable appearance of
the macular area in ophthalmoscopy
or biomicroscopy
 (diagnostic tool that isused mainly in screening,detection and
monitoringmacular diseases)

3. procedures
 Each chart substends 20 degrees when viewed at the
distance of 28-30 cm.
 Each square subtends an angle of degree 1 degrees
 The patient is made to wear his reading glasses if any,
holds the chart at (30cm) away in front of the eye.
 Patient looks with each eye separately by covering one
eye.
 Asked to focus at the small dot in the centre of the grid.

4.  While he is looking at the dot, ask him to report if
any line on the grid is (distorted, broken, blurred
area, missing area, dark area, corners, sides, holes,
spots).
 Mark the area of abnormality, if any on the chart

5. Types of amsler chart
 Chart 1: it is standard chart, consist of white grid on a
black background with a central fixation point
Use in every cases enabling to
identify vairous form of distortion
and scotoma
Chart 2: similar to first chart with
additional two diagonal lines
extending from fixation point

6. Chart 3: it has red grid on a black
background for use when investigating
scotoma for color.
Chart 4: it has white dot but
no lines on a black background
which is designed to detect
scotoma only.
.

7. Chart 5: it has white parallel
line on black background,
oriented both horizontally and
verticality to detect metamorphopsia
Chart 6: Has black parallel line
on a white background, with 2 additional
linesin 1° also designed
for detecting metamorphopsia.
Chart 7: similar to chart 1 but
contain small squares in central 8°

9. Thank you.
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