Originally Posted by
bakerin
My visual acuity etc is fine, it is an issue with heterophoria (calibration between the eyes) essentially causing a slight offset and subsequently double vision in some cases. It is a bit of a grey area in terms of the CAA, so I'd like to try the foreign medicals (TC & FAA) that are less strict.
I guess you've been through all this with the CAA, but looking at the EASA rules at least they say:
Binocular function
Applicants with heterophoria (imbalance of the ocular muscles) exceeding:
(1) at 6 metres: 2.0 prism dioptres in hyperphoria, 10.0 prism dioptres in esophoria, 8.0 prism dioptres in exophoria and
(2) at 33 centimetres: 1.0 prism dioptre in hyperphoria, 8.0 prism dioptres in esophoria, 12.0 prism dioptres in exophoria
should be assessed as unfit.
A fit assessment may be considered if an orthoptic evaluation demonstrates that the fusional reserves are sufficient to prevent asthenopia and diplopia.
It seems to me like there is at least a possibility of getting your Class 1 (with EASA, but I assume CAA are very similar if not the same) with a proper orthoptic evaluation?
In the UK the best person to consult about this is
Dr Adrian Chorley at Aviation Vision Services. Don't rule anything out until you speak to him.