If you see something does that mean it exist?

Answer 1

Yes. Even if the question was ... If you think you see something, ... or anything of that sort ... then referring to the Marion Websters dictionary ... (EXIST)

1 a : to have real being whether material or spiritual b : to have being in a specified place or with respect to understood limitations or conditions ed in his mind>.

If the question was, "If you see something, does that mean it 'really' exists?" Then referring to the Marion Websters dictionary ... (REAL)

2 a : not artificial, fraudulent, or illusory,

the answer would be NO. If it were an illusion, or product of your state of mind, that makes it illusory. Existing, and really existing, are two subtly, different things.

As the question stands, the answer is YES. However, I would recommend improving the question, as someone might come along and delete this because of their own opinion - without looking up (or knowing) what the words actually mean. We cannot read into the question or guess at what you are asking. We have to take the question in its broadest, most literal meaning.

Answer 2

Seeing something suggests its existence, as our sense of sight perceives the physical presence of objects. However, our senses can sometimes be deceived or misinterpret what we see, so it is not a definitive proof of existence. Additional evidence or confirmation may be needed to establish the true existence of something.