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NVRI Products Logmar Charts and more

ORDERING NVRI PRODUCTS

To order please email membership@aco.org.au with your order quantity, name, postal address and phone number. Postage and handling costs will be advised and an invoice for payment will be emailed to you.

Any queries please call either +61 3 9349 7477 or +61  3 9349 7519

LOGMAR CHARTS

Based on the original 6 metre distance acuity chart designed by Ian Bailey and Jan Lovie-Kitchin.
Bailey, IL and JE Lovie. "The design and use of a new near-vision chart". Am J Opt Physiol Optics(1980)57:378-387

The charts are available printed on stiff white board for external illumination.

Three-metre LogMAR chart - $121.00 IS BACK IN STOCK


This chart is designed for use at a distance of three metres.
It consists of LogMAR letters (14 rows) printed on 510 x 510 mm stiff white board and comes framed in frosted aluminium. It is available with visual acuity specified using a 3 metre test distance (3/30-3/1.5) and with the conventional Snellen fraction notations (6/60-6/3).

Paediatric chart $121.00


This 3-metre chart (510 x 510 mm) uses symmetrical LogMAR letters (3/30 to 3/1.5) and comes with a laminated key card which is used by the subject to make a non-verbal response. This chart is framed in frosted aluminium.

Hi-Lo contrast LogMAR chart $121.00 IS BACK IN STOCK


This chart presents a side by side view of 2 LogMAR letter series (3/19 - 3/3.8). One is of normal contrast and the other of 10% contrast. It can be used reliably in low vision testing by reducing the test distance. The chart comes mounted in a frame for extra durability.

KITS

Rapid vision testing kit - $121.00

This economical kit is ideal for the General Practitioner. It can be used in the consulting room or in various external situations to provide a rapid assessment of visual performance. It consists of:

·         LogMAR Distance chart, 6/48 to 6/3 letters
·         LogMAR word reading card
·         Amsler chart
·         Guidelines for the use of the charts

TESTS

Melbourne Edge Test -  $135.00 printed on photo paper - AVAILABLE

The Melbourne Edge Test (MET) was originally designed by Jos Verbaken to permit fast and reliable assessment of the peak of the Contrast Sensitivity Function. The chart consists of a single luminance profile in four different orientations: horizontal, vertical, 45° left, and 45° right.

The MET is a non-grating contrast sensitivity chart. This test measures the contrast threshold for a single luminance profile edge, which is an aperiodic stimulus. There is psychophysical evidence that the edge contrast threshold is determined by the most sensitive spatial frequency channel, the higher threshold for a single edge with respect to the better performance for optimum spatial frequency gratings being due to probability summation. Forced choice methods of threshold determination have been shown to provide a more reliable measurement than the method of adjustment and other methods in which the patient's response criterion is not controlled. In this test the edge is presented at four different, randomly sequenced orientations. As orientation selectivity is a post-retinal function, orientation losses are diagnostic for optic nerve and visual cortex dysfunction. If an orientation defect is suspected it can easily be confirmed by presenting the chart in both normal horizontal format and by rotation in a vertical format.

Johnston LogMAR visual acuity calculator - $15.00

This ingenious sliding card is used for calculating acuity when using LogMAR charts at any distance. It comes with instructions.

Magnification chart - $55.00

This comprises a set of 8 newspaper style text passages of different font sizes, ranging from 5 to 96 points. It is particularly useful for rapid assessment of the magnification needs of the low vision patient.
The chart is an A3 card laminated in a matte finish, folded in the middle. Fully opened, the chart measures 420 x 297 mm.

LogMAR word reading cards - $88.00

The reading cards are for use at a distance of 250 mm. They were designed by Ian Bailey and Jan Lovie at the NVRI and are based on the same principle as the distance charts. They contain 17 rows, each with up to six unconnected words of 4, 7 and 10 letters.
Bailey, IL and JE Lovie. "The design and use of a new near-vision chart". Am J Opt Physiol Optics(1980)57:378-387
Four different word sets, printed on white card (205 x 260 mm), are supplied.
The cards are laminated.

Amsler chart - $33.00

This simple, robust and economical chart, printed on plastifoam board is ideal for monitoring macular performance in the consulting room or at home.