Evidence for a Learning Effect in Short-Wavelength Automated Perimetry (original) (raw)

Predictive value of short-wavelength automated perimetry

Ophthalmology, 2002

To determine whether structural changes in the retinal nerve fiber layer (RNFL) and functional abnormalities in short-wavelength automated perimetry (SWAP) can predict the onset of functional losses in standard automated perimetry patients suspected of having glaucoma.

The learning and fatigue effect in automated perimetry

Graefe's Archive for Clinical and Experimental Ophthalmology, 1991

A visual field test was performed on 100 volunteers to study learning or fatigue effects during one session. The test was carried out with the help of the Octopus program Jl, which measures the threshold 12 times at 3 test locations. In the majority of cases the sensitivity was quite stable during the session. We noted no difference between trained and untrained subjects or between normal and pathological eyes. However, patients with refractive errors, especially myopes, revealed a larger learning effect than did emmetropes.

A Review of Learning Effect in Perimetry

Ophthalmology Research: An International Journal

Glaucoma is the second most common cause of visual impairment in the UK, with visual impairment registrations have increased by 22% since 2010. Glaucoma refers to a group of optic neuropathies leading to visual impairment and blindness. If glaucoma remains untreated, it may produce optic nerve damage, leading to vision loss. Consequently, visual field tests can be extremely valuable for glaucoma. At the same time, visual field assessment should be performed at baseline and periodically in the glaucoma follow-up or monitor the effectiveness of adopted therapeutic schemes. Any visual field test can be masked by one or more artefacts, which can either lead to the incorrect result of visual field loss or to the possible deterioration of existing loss. One of the most important factors is the perimetric learning effect that is present in almost all types of perimetry. To minimize the learning effect, we either have to conduct a practice test procedure, as a demonstration for the patient ...

A New Rapid Threshold Algorithm for Short-Wavelength Automated Perimetry

Investigative Opthalmology & Visual Science, 2003

PURPOSE. To develop and test a short and reliable visual field threshold program for the early detection of glaucomatous visual field loss, by adapting the Swedish interactive test algorithm (SITA) to short-wavelength-automated-perimetry (SWAP). METHODS. Computer simulations were performed to test the accuracy of several versions of SITA SWAP, and to optimize speed versus reliability. The selected SITA SWAP version was evaluated and compared with the older Full Threshold SWAP and Fastpac SWAP programs in 41 patients with glaucoma and normal subjects. RESULTS. Average test time was 3.6 minutes for SITA SWAP, 11.8 minutes for Full Threshold SWAP, and 7.7 minutes for Fastpac SWAP, differences were significant at P Ͻ 0.0001. Mean threshold reproducibility, calculated as absolute difference between two tests, did not differ significantly between programs and was 2.4 dB for SITA, 2.3 dB for Full Threshold, and 2.4 dB for Fastpac SWAP. Simultaneous comparison showed significant differences in threshold sensitivity, P ϭ 0.023: SITA SWAP showed highest sensitivity, 21.6 dB on average, compared with both Full Threshold SWAP and Fastpac SWAP with a mean sensitivity of 17.3 and 17.8 dB, respectively. CONCLUSIONS. SITA SWAP was much faster than the older SWAP strategies, and reproducibility did not differ. This implies that SITA SWAP could become a clinically useful method for the detection of early glaucoma. SWAP tests may also be applicable in larger groups of patients because of the increased dynamic range.