Horani A, Frenkel S, Yahalom C, Farber MD, Ticho U, Blumenthal EZ.

J Glaucoma. 2002 Dec;11(6):511-6.
Department of Opthalmology, Hadassah University Hospital, Hadassah Medical School, Jerusalem, Israel.


PURPOSE: To evaluate the presence, duration and magnitude of a learning effect in serial visual field (VF) testing, using the commercially available frequency doubling technology (FDT) instrument.

PATIENTS AND METHODS: 21 healthy adults with no prior VF experience underwent 6 serial VF tests, using the full-threshold C-20 program of the Zeiss-Humphrey FDT analyzer, on one randomly chosen eye. Tests were spaced at least two days apart.

RESULTS: The average mean sensitivity was 32.37 +/- 2.6 dB; the average mean deviation (MD) was 1.22 +/- 1.8 dB. The MD at the first examination (0.28 +/- 2.1 dB) was significantly poorer than at any of the other testing sessions (p<0.003). Similarly, the mean sensitivity at the first examination (31.16 +/- 3.0 dB) was significantly lower than any other testing session (p<0.004). The proportion of improvement from the first to the second session was 63% and 65% of the total improvement, for mean sensitivity and MD, respectively. Mean test duration showed a modest reduction, from 4.40 +/- 0.3 minutes in the first session to 4.17 +/- 0.4 minutes in the last session (p = 0.023). A sub-analysis comparison of the different VF segments showed a more prominent learning effect in the peripheral and nasal visual segments (p<0.0001).

CONCLUSION: Baseline measurements should best rely on the second testing session, since MD and mean sensitivity are somewhat poorer when subjects with no prior VF experience are first tested on the FDT instrument. This may be especially true for the purpose of following patients over time.

Article as Full-Text PDF

Glaucoma & Cataract:



This website was written by Prof. Eytan Blumenthal, to better understand glaucoma & cataract. This information should not replace medical consultation.

Related Posts

Risk Factors and Incidence of Ocular Hypertension After Penetrating Keratoplasty
Faik Oruc¸oglu, MD, Eytan Z. Blumenthal, MD, Joseph Frucht-Pery, MD, and Abraham Solomon, MD Journal of Glaucoma. 2013 Feb 19. Kudret Eye Hospital, Istanbul, Turkey Department of Ophthalmology, Hadassah-Hebrew...
List of Publications- by Prof. Eytan Blumenthal
ORIGINAL RESEARCH PAPERS Blumenthal EZ. Adjusting the slit-lamp oculars: An unnecessary burden or a must?  Survey of Ophthalmology 1995;40(3):225-228. Abstract Full-text (PDF) Blumenthal EZ, Serpetopoulos...
Adjusting The Slit-Lamp Oculars: An Unnecessary Burden Or A Must?
Blumenthal EZ. Surv Ophthalmol. 1995 Nov-Dec;40(3):225-8. Department of Opthalmology, Hadassah University Hospital, Jerusalem, Israel. ABSTRACT: Adjusting the slit-lamp eyepiece rings is perceived by some...
On Focusing The Slit-Lamp: Part I. An Inaccurate Ocular Setting--What Is There To Lose?
Blumenthal EZ, Serpetopoulos CN. Surv Ophthalmol. 1998 Jan-Feb;42(4):351-4. Department of Ophthalmology, Hadassah University Hospital, Jerusalem, Israel. ABSTRACT: Adjustments of the diopter rings on the...
Early Transient Visual Acuity Loss After Lasik Due To Steroid-Induced Elevation Of Intraocular Pressure
Frucht-Pery J, Landau D, Raiskup F, Orucov F, Strassman E, Blumenthal EZ, Solomon A. J Refract Surg. 2007 Mar;23(3):244-51. Department of Ophthalmology, Hadassah-Hebrew University Medical Center, Jerusalem,...