Double vision when I look down suddenly?

For instance if I were to be looking at the board and look down at my iphone screen my vision suddenly looks doubled and it makes me a bit dizzy it only lasts for a few seconds

You may be farsighted. Get an eye exam.

This sounds like a squint. My sister has one and it gradually got worse. Soon she was walking into walls as she thought there were doors there. Go have it checked by the opticians, it might not be a squint but you should check. You may need glasses. If you don't want glasses you can always have contact lenses

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