A prescription can not help to determin what a patient's overall visual acuity is. Your visual acuities are determined based on a test using the Snellen chart at a distance of 20 ft. Your VAs are also different "corrected" or "uncorrected", one meaning with your glasses and the later meaning without your glasses on. Those numbers will be different. Ask your eye care provider for the information that your doctor obtained during your examination. Thank you.
1/20 or 1 over twenty
450 - 20% = 360
22.5
100% = 450 1% = 450/100 20% = (450/100) x 20 = 9000/100 = $90
Yes, 20 15 vision is better than 20 20 vision.
20 percent of 450 is 90.
450 decreased 20% results in: 360
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.
20/10 vision refers to vision better than 20/20. A person having 20/10 vision would be able to see something at 20 feet that a person with 20/20 vision would see at 10 feet.
2-450= -430
200/900, 100/450, 22/99 are some examples.
450 x 0.2 = 90