Correct spelling, explanation: vision is a noun, which comes from the Latin form videre, which means to see. Vision entered Middle English through Old French, but initially, it was used to denote some supernatural apparition. In modern English, the meaning of vision has extended and it refers mainly to the ability to see.

Definition of vision:
1. noun – a mental image of something,
In my vision of the future, I live somewhere in the countryside, with my husband, two kids, and a dog.
2. noun – the ability to see,
The vision in my right eye is blurred after the eye drops that my optician prescribed me.
3. noun – a religious experience, which can’t be physically explained
In her visions, she saw an angel who told her to become a nun.

Collocations with vision:
A few commonly used collocations with vision include: excellent vision, in someone’s line of vision, and clear vision.
Before he became a pilot, he had to go through eye tests, which confirmed that he has excellent vision.
Some people were standing in my line of vision so I couldn’t see the stage well.
As a founder of this company, I have a clear vision of the development and expansion of overseas markets.

Incorrect spelling, explanation: vision has a rather simple spelling, but due to its pronunciation it is often misspelled as vison – without the second -i letter. It is true that in speech the second -i letter is not recognizable, but it has to appear in spelling and that’s why the only correct version is vision.