Hi there,
This article will be of use to you...
http://www.askcaptainlim.com/index.php?option=com_content&view=article&id=854:what-are-the-eyesight-requirements-for-airline-pilots-&catid=50:eyesight&Itemid=73
See the part just below the table that reads "JAR Class 1 Requirements".
It then states what the limits are for the Class 1 JAR medical, eye-sight wise.
+0.50 and +2.00 readings are the Dioptres for your eyes.
Hope this helps!
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