On the standard near vision eye chart you must be able to read the N5 print between 30 and 50 cm and the N14 print at 100 cm, with or without correction. Contact Lenses – You may wear contact lenses as a professional pilot, but they must be monofocal, nontinted and for distant vision (not to correct near vision). Any contact lenses should be brought to the examination. Color Vision – You will be tested for normal color vision with Ishihara Test Plates (a series of numbers or shapes outlined by different colored dots, easily seen by someone with normal color vision). If you fail these you will need to pass an approved lantern test (a series of colored lights that you must identify correctly) in order to gain a Class 1 certificate.
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Eye Function – You must have normal fields of vision. You must not suffer from double vision. Any degree of heterophoria (eye muscle imbalance) in excess of: 8Δ Exo, 10Δ eso or 2Δ hyperphoria – measured at 6 m or 12Δ exo, 8Δ eso or 1Δ hyperphoria – measured at 33 cm will require further evaluation by an eye specialist. There must be no acute or chronic disease in either eye or surrounding structures.