Can you have a “normal” vision?
Nobody has a “normal” vision. Your vision depends on several factors, such as behavioural, lifestyle, and genetics. In some cases, your vision may change as you grow. Optometrists use 20/20 vision to clinically access vision. You can correct myopia and hyperopia with laser eye surgery, contacts, or glasses. Contacts and glasses increase the refracting strength of the eyes, and laser surgery.
References
[1] https://www.healthline.com/human-body-maps/optic-nerve
[2] https://www.mayoclinic.org/diseases-conditions/retinal-diseases/symptoms-causes/syc-20355825
[3] https://www.webmd.com/migraines-headaches/migraines-headaches-basics
[4] https://www.nhs.uk/conditions/squint/
[5] https://diabetes.org/
[6] https://www.ncbi.nlm.nih.gov/books/NBK549919/