Zeiss Humphrey II-i series, User Manual

Page: 81 / 580

Humphrey Field Analyzer II-
i
series User Manual 2660021145640 A
Setting-Up Tests 3-7
Esterman Functional Tests
Much like the Snellen scale for central acuity, the Esterman scale is especially useful for evaluating
visual capability or disability in industry, law, and government (workers’ compensation, motor
vehicle, aviation, and military). The Esterman test is listed as an option for many disability
screenings. Carl Zeiss Meditec is grateful to the American Academy of Ophthalmology for providing
us with the rights to offer the Esterman test for your use.
The Esterman test scores are based on a relative value scale, which is divided into unequal units of
100 for monocular tests and 120 for binocular tests. Each unit is equated to one test point and is
given a value of 1% in the monocular field and 0.83% in the binocular field. The inequality in the
size and distribution of the units, with greater unit density in more important areas, makes the scale
functional. The HFA II-
i
automatically yields the functional score as a percentage and prints it in the
lower corner of the printout.
Monocular tests incorporate 100 points and extend 75 degrees temporally and 60 degrees nasally.
Binocular tests incorporate 120 points and extend 150 degrees bitemporally. Each stimulus duration
is 400 milliseconds with a single intensity Goldmann stimulus of III 4 E (10 dB). These settings have
been standardized by international agreement and may not be altered by the user. You may only
change the test speed. Refer to
Chapter 5 for special testing instructions.
Entering Patient Data
Once you have selected the test and test eye, you will be ready to input patient data. You can input
a variety of information about your patient each time he or she takes a visual field test. The patient
data section is divided into two main screens: Patient Data 1 displays demographic and trial lens
information; Patient Data 2 displays diagnostic information. The required entries on the Patient Data
1 screen are Patient ID, Patient Name and Date of Birth. You need not enter all information
requested; however, always enter a patient ID, a name and date of birth since they are required for
trial lens calculations, data analysis, and saving the test to disk. If a Patient ID is not entered, one is
automatically created. Also Gender will default to UNKNOWN.
Note: The HFA II-
i
5.x database is different from previous software versions in what determines
patient uniqueness. To be compatible with EMR/PMS/DICOM systems, a Patient ID is now required.
In the 5.x database, a patient is determined to be unique by only two fields—Patient ID and Issuer
of ID. A Patient ID is required, but the Issuer of ID is optional. Issuer of ID (Issuer of Patient ID) is a
DICOM data field to specify the assigning authority of the Patient ID. See
“Patient Uniqueness—
Patient ID and Issuer of ID,” on page 14-39 , and “Specifying Your Practice’s Issuer of ID,” on
page 14-40 .