Sorry, but you need to define "very high". Here is the standard:
a. Current distant visual acuity of any degree that does not correct with spectacle lenses to at least one of the following (367):
(1) 20/40 in one eye and 20/70 in the other eye (369.75).
(2) 20/30 in one eye and 20/100 in the other eye (369.75).
(3) 20/20 in one eye and 20/400 in the other eye (369.73).
b. Current near visual acuity of any degree that does not correct to 20/40 in the better eye (367.1-367.32).
c. Current refractive error (hyperopia (367.0), myopia (367.1), astigmatism (367.2x)), in excess of -8.00 or +8.00 diopters spherical equivalent or astigmatism in excess of 3.00 diopters.
Waivers can be had but are difficult if the error is more than +/-8 diopters. Mostly because of the increased chance of retinal detachment.