Vision is not less important in mammals than any other family of vertebrates.
that means that you have perfect vision__________________________________________________________The numerator refers to within what distance of certain objects you have to be to distinguish them. The denominator refers to within what distance of certain objects a "normal" person has to be to distinguish them. Therefore, 25/25 vision is much like 20/20 vision in that it indicates normal/perfect vision. If the numerator is greater than the denominator (20/15), one's vision is better than normal. If the denominator is greater than the denominator (20/40), one's vision is worse than normal.
because of your mum
farsighted
The highest level of eye vision is considered to be 20/10, which means a person can see at 20 feet what a person with normal vision can see at 10 feet. This level of vision is rare and considered better than normal 20/20 vision.
Someone with less than perfect vision.
less than normal
It means seeing at 20 feet what a person with normal vision sees at 20 feet. A person who has 20/40 vision can see at 20 feet what the person with normal vision sees at 40 feet, etc. Some people have better than 20/20 vision.
Normal vision is 20/20 vision, or in metric 6/6. This means that when you are 20 feet away from something, you will see what someone with normal vision would see at 20 feet away. With 20/40 vision, you would see something 20 feet away as someone with normal vision would see it at 40 feet, so therefore it would be blurry. 20/100 is also possible and 20/200 is considered legal blindness. 20/10 would be better than normal. (Adapted from howstuffworks.com)
25/50 vision refers to a measurement of visual acuity, indicating that a person can see at 25 feet what a person with normal vision (20/20) can see at 50 feet. This means their vision is less sharp than average, and they may require corrective lenses or other interventions to improve their sight. In simpler terms, their clarity of vision is diminished compared to standard visual acuity.
Less than 30CMH2o
Baked Ruffles contain much less fat than normal Ruffles. Baked Ruffles still have fat in them, but not nearly as much as normal Ruffles. Baked Ruffles have less than half the fat of normal Ruffles.