He did have blurry vision, thats why he used strong colors very often
Perfect vision
Not likely. While perfect vision or even near perfect vision are necessary for enlistment, enlistees cannot be legally blind.
it can if it scratches your eyes
Heat vision is like laser eyes, but using it in a heating way... Laser eyes are shooting lasers out of your eyes
Yes, eyes are able to see things as long as the person is not blind. A person that is able to see though can have various ranges that they are able to see, some having perfect vision. Others can be farsighted or nearsighted.
It is a common misconception that 20/20 is perfect vision. In reality, having 20/20 visions means that you can see from 20 feet what a normal person can see from 20 feet. 20/15 vision means you can see from 20 feet what a normal person can see from 15 feet. Perfect vision means that your eyes perform the following processes perfectly: 1. Refraction of light 2. Accommodation of the lens 3. Constriction/dilation of the pupil 4. Convergence of the eye
Common symptoms are: dry eyes, pain in and around the eyes, blurry vision, double vision, burning eyes, watery eyes and small spasms or twitches around the eyes.
If the insect in question has both complex eyes and simple eyes. the simple eyes are for close range vision while the complex eyes are primarily for longer range vision. If the insect has no complex eyes, then their simple eyes are used best they can for all around vision.
Emmetropia
Normal vision in both eyes results in the right half of the visual field being dominant. The absence of vision in both eyes results in the left half of the visual field being dominant.
Perfect vision is not required to enter the 2020 olympics. As song as you are still able to be competitive, the olympics don't care about your vision. If your vision is poor enough to limit your ability to compete with people with better vision, there's always the paralympics.