Zeiss Humphrey Field Analyzer 3 - Page 136

Determine Trial Lens Go to Contents
HFA3 Instructions for Use 2660021166131 Rev. A 2018-11
B-2
Note: If the patient is aphakic or needs a high refractive power such as +8.00 D, contact lenses may
provide the best visual field testing conditions.
Age Distance R
x
–
0.50
Distance R
x
–1.00
Distance R
x
–1.50
Distance R
x
–2.00
Distance R
x
–2.50
Distance R
x
–3.00
Distance R
x
over –3.00
Under 30 No trial lens
needed
No trial lens
ne
eded
No trial lens
needed
No trial lens
needed
No trial lens
needed
No trial lens
needed
(Dist. R
x
) + (+3.25 D) for trial lens
30–39 +0.50 D No trial lens
ne
eded
No trial lens
needed
No trial lens
needed
No trial lens
needed
No trial lens
needed
(Dist. R
x
) + (+3.25 D) for trial lens
40–44 +1.00 D +0.50 D No trial lens
ne
eded
No trial lens
needed
No trial lens
needed
No trial lens
needed
(Dist. R
x
) + (+3.25 D) for trial lens
45–49 +1.50 D +1.00 D +0.50 D No trial lens
ne
eded
No trial lens
needed
No trial lens
needed
(Dist. R
x
) + (+3.25 D) for trial lens
50–54 +2.00 D +1.50 D +1.00 D +0.50 D No trial lens
needed
No trial lens
needed
(Dist. R
x
) + (+3.25 D) for trial lens
55–59 +2.50 D +2.00 D +1.50 D +1.00 D +0.50 D No trial lens
needed
(Dist. R
x
) + (+3.25 D) for trial lens
60 & Over +2.75 D +2.25 D +1.75 D +1.25 D +0.75 D No trial lens
needed
(Dist. R
x
) + (+3.25 D) for trial lens
Table B-2 Spherical Trial Lens Correction for Cen
tral Visual Field Testing of Myopic Patients