Australian vision chart Chart 5. (LogMAR low contrast letter chart)

Catalogue Number: 1408
Australian vision chart Chart 5. (LogMAR low contrast letter chart)
Category: Equipment
Sub-Category: Visual Acuity, Contrast sensitivity tests
Designer/inventor: VERBAKEN Jos H
Year Of Publication/Manufacture: 1986
Time Period: 1940 to 1999
Place Of Publication/Manufacture: Melbourne
Publisher/Manufacturer: J Verbaken
Description Of Item: Side-by-side pair of LogMAR visual acuity letter charts, one high contrast and one low contrast, printed on a single A3 size card, with aluminium frame, 284 x 410 mm, identified as AUSTRALIAN VISION CHART Chart 5 Copyright 1986 J Verbaken. Handwritten on the back 'Donated to Kett Archive at ACO by J Verbaken 7/1/2010 Chart Serial number 98014'. 12 lines of letters designatedin LogMAR notation from 1.3 to 13 (largest line size not designated). Test distance not specified.
Historical Significance: The clinical measurement of contrast sensitivity as a function of spatial frequency was of interest in the 1980s and various groups devised tests that were practical to use in the consulting room. Jos Verbaken, a staff optometrist in the clinic of the Victorian College of Optometry, was one of them. He devised this test to sample low contrast letter visual acuity. He also devised the Melbourne Edge test to measure low spatial frequency contrast sensitivity (See Cat No 1407).See: Verbaken J Role of the contrast sensitivity function in clinical practice. Am J Optom Physiol Opt. 1987 Apr;64(4):290-5. Verbaken JH, Johnston AW Population norms for edge contrast sensitivity.Am J Optom Physiol Opt. 1986 Sep;63(9):724-32. Verbaken JH, Jacobs RJ. The technical problems of producing photographic prints for the measurement of human contrast thresholds. Ophthalmic Physiol Opt. 1985;5(4):459-65. Greeves AL, Cole BL, Jacobs RJ.Assessment of contrast sensitivity of patients with macular disease using reduced contrast near visual acuity charts. Ophthalmic Physiol Opt. 1988;8(4):371-7. 3. Greeves AL, Cole BL, Jacobs RJ Reliability and validity of simple photographic plate tests of contrast sensitivity. Am J Optom Physiol Opt. 1987 Nov;64(11):832-41.
How Acquired: Donated by Jos Verbaken, optometrist
Date Acquired: Jan 2010
Condition: Excellent
Location: Archive room. West wall. Unit 4 Drawer 3

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