vision
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what is the lowest standard of vision needed 2 pass the 3rd class medical
Can a person who wears an eye patch qualify
this question is posed 2 answer an argument
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There are about 1,200 one eyed Airline Transport Pilots.
Yes it can be done!
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The official standard for Third Class is 20/40 in each eye separately with or without correction.  If correction is required, the corrective lenses must be worn while flying.  However, there is a protocol to allow pilots who meet the standard in one eye only to obtain a Statement of Demonstrated Ability (aka "waiver"j and get a Third Class despite the problem  See:

https://www.faa.gov/about/office_org/headquarters_offices/avs/offices/aam/ame/guide/app_process/exam_tech/et/31-34/mv/
https://flightphysical.com/medical-workup/monocular-vision-flight-test
https://fsims.faa.gov/wdocs/8900.1/v05%20airman%20cert/chapter%2008/05_008_001rev1.htm (see paragraph E.4))