How Does One Improve The Strength Of Your Eyes Thus Improving The Quality Of Your Vision Naturally?

are they any alternatives to reducing the pressure in the eye? how does one correct astigmatism?

Astigmatism Strength?

I just got back from the eye doctor today and I asked him if I had an Astigmatism (I thought I was told I did, but I wasn’t sure) he said I had a very very slight one. He said he could barely tell if I had one or not. I don’t wear toric lenses I wear normal contact lenses. The strength is -5.25. I was planning on joining Army ROTC but I just found this in the medical requirements:
c. Refractive error (hyperopia (367.0), myopia (367.1), astigmatism (367.2)), in any spherical equivalent of worse than –8.00 or + 8.00 diopters; if ordinary spectacles cause discomfort by reason of ghost images or prismatic displacement; or if corrected by orthokeratology or keratorefractive surgery. However, for entrance into a military academy or ROTC programs, the following conditions are disqualifying:
(1) Astigmatism, all types over 3 diopters.
(2) Hyperopia over 8.00 diopters spherical equivalent.
(3) Myopia over 6.75 diopters spherical equivalent.
(4) Refractive error corrected by orthokeratology or keratorefractive surgery.
Am I qualified? I know my normal contact diopters is -5.25, but I am not sure is astigmatism diopters and normal diopters are the same. This is what I have wanted to do my entire life and I really need to know this.