Zeiss Humphrey II-i series, User Manual

Page: 110 / 580

Test Parameters and Strategies
Humphrey Field Analyzer II-
i
series User Manual 2660021145640 A
4-10
SITA Testing
Perimetry results are critical in the management of glaucoma and other eye diseases. Yet, it can
often be difficult to obtain quality results. Threshold tests are often demanding and uncomfortable
for patients. They tie-up staff and tire out patients, thus decreasing test reliability. The SITA testing
strategy is a major advance over the previous methods used.
Carl Zeiss Meditec developed the two separate SITA testing strategies with two separate goals:
1. SITA Standard: The goal was to design a perimetric thresholding method which collects twice
as much information per unit time as the original Humphrey Full Threshold standard
algorithm. SITA Standard cuts the test time in half without compromising test reproducibility.
2. SITA Fast: The goal was to design a thresholding method which collects twice as much
information per unit time as FastPac. SITA Fast cuts the test time in half relative to FastPac,
without compromising test reproducibility.
Tests Available with SITA
Both SITA Standard and SITA Fast are designed to run with only these threshold tests:
• Central 10-2
• Central 24-2
• Central 30-2
• Peripheral 60-4
SITA-SWAP is designed to run with only the following threshold test:
• Central 24-2
File Directory Indicators for SITA Tests
On the File Directory screens, the SITA Standard tests are indicated by the letters “SS,” SITA Fast
tests are indicated by the letters “SF,” and SITA-SWAP are indicated by “SSW.” For example: SF-30-2.
Note: Additional information on SITA can be found in “Threshold Test Printout Formats,” on
page 7-3 and Appendix (K), "SITA Normative and GPA Databases" .
SITA References
1. Bengtsson B, Olsson J, Heijl A. Evaluation of a new threshold visual field strategy, SITA, in normal
subjects. Acta Ophthalmol. Scand . 1998: 76: 165-169.
2. Bengtsson B, Heijl A. Evaluation of a new perimetric threshold strategy, SITA, in patients with manifest
and suspect glaucoma. Acta Ophthalmol. Scand. 1998: 76: 268-272.
3. Bengtsson B, Heijl A. SITA Fast, a new rapid perimetric threshold test. Description of methods and
evaluation in patients with manifest and suspect glaucoma. Acta Ophthalmol. Scand . 1998: 76: 431-437.
4. Bengtsson B, Olsson J, Heijl A, Rootzen H. A new generation of algorithms for computerized threshold
perimetry, SITA. Acta Ophthalmol.Scand . 1997:75: 368-375.