There are a few ways:
#1 It can be hereditary
#2 Reading without proper lighting. (Kids think just because they CAN read in the dark, they WILL)
#3 Also straining their eyes, for example, if you see them squinting while reading or even watching TV, this is a clear sign, they need corrective glasses, and in many cases, if caught in time, they would only need to wear them for a year or so. (Headaches while in School or reading, is also a clear sign.)
#4 Hair in their eyes. Hair gets dirty and dusty, and when dangling in the eyes everyday, it can cause problems with their vision.
I hope this helps.
Nancy
The main causes are greed, envy and poverty.
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the main problem is a problem that occurs in the middle of the story
the main problem is a problem that occurs in the middle of the story
What are the three main causes of corrosion?
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