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Just had eye test I am told i need one for driving. one for reading and one for watching my computer monitor. I no i need them but how come my 12 year old grandson who strugles to see without glasses has one pair for every thing.
The young human eye can change focus from distance (infinity) to 7 cm from the eye in 350 milliseconds. This dramatic change in focal power of the eye of approximately 13 diopters ...... The age-related decline in accommodation occurs almost universally to less than 2 dioptres by the time a person reaches 45 to 50 years, by which time most of the population will have noticed a decrease in their ability to focus on close objects and hence require glasses for reading or bifocal lenses. Accommodation decreases to essentially 0 dioptres at the age of 70 years.