But, We have no good way of verifying our senses. The only way we have is to use another sense to corroborate the sensation in question. But that sense is equally questionable as the other sense leading us back to where we started. Indeed, there is no sure way to tell how, or if, the information from the outside world relates to what we perceive. Believing in our senses as a source of knowledge when the truth cannot be justified creates doubt in the mind whenever we experience through our senses. For example, if a chair was presented before us and through our sight determines that it is a chair, but in order to confirm our observation we must go and touch it. But our touch sense is just as questionable as our sight is. In this case, you are using two senses that are equally questionable, where both may not provide the truth. .
Knowledge acquired through the senses transmits to our mind in order for us to understand what our senses are telling us. During this accumulation, another problem is encountered known as deception. When we perceive, we begin to understand things on how they seem, which is different from others and sometimes from the truth. If our senses only reveal knowledge about how things seem, how can we hope to use them to find out how things really are? The appearances are obstructing rather than helping us in our attempts to discern the nature of reality; perception casts a veil over the world rather than revealing it to us. To assert that reality ends where our perceptions end is completely unjustified. If we cannot see or otherwise perceive something it doesn't mean that it doesn't exist. Another skeptical difficulty here derives from the argument from illusion. .
Illusions may cause us to believe something is there which actually is not or did not happen. Illusions of sight are known as optical illusions and are used by magicians like David Copperfield to lead the audience into believing he performed magic while he actually performed an illusion to trick them.