VEALE-ALLBLAX LogMAR READING CARD
(LogMAR. - Log Minimum Angle of Resolution)
Product Ref: EYOLOGRC
The Veale-Allblax LogMAR reading card is to
be used at 25cm (10 inches) from the eyes.
his reading card is designed with LogMAR letter sizing starting at 1.6 through to 0.0 in 0.1 steps. 16 lines in total with Snellen Notation equivalent point size numbers alongside each LogMAR number for easy referencing.
Size: 272mm x 185mm
How to use this reading test card
(For people with low vision acuity who need to know what power magnifier they should acquire. This is an approximation method only.)
Find which line can be fully read without error when wearing normal reading glasses. Note the LogMAR line number. Then decide which line you reasonably wish to read. Count the number of lines between the first number and the desired line. The number of lines becomes the "times" magnification required, e.g. reading line 1.2 (without error), desires to read line 0.6. Five lines between lines 1.2 and 0.6 therefore magnification required 5X.
This LogMAR reading card is particularly useful when a Snellen notation at a specific reading distance is required. If a test for an intermediate distance - say 1 metre (39.37 inches) is required, place the card at 1 metre from the reader's eyes and record the "N" number which the reader scores 100% accuracy. Test individual eyes, using the hand to covering the alternative eye, then test with both eyes (binocular). Record the "N" line number each time as required.
If a reading test for 14 inches is required, place the card at 14 inches from the eyes and record the "N" number of the line that is read 100% correctly.
For technical information regarding LogMAR notation - click here.