Mechanism of View and Sensory Error in the Viewpoint Original Research of Naşīr al-DĪN Țūsī

How to see the object and the occurrence of sensational errors is one of the leading questions in any epistemological system, including Tusi's epistemology. The importance of this case in the opinions of Islamic philosophers is due to the fact that the senses and their data initiate the process of realizing certain and true wisdom about objects. Questions around this case just like the other philosophic matters have always been a great worry for Nasir-Aldin Tousi and he's tended and paid attention to them in his works. This article tries to express how sensational errors occur in his opinion by considering differences between emotions and sensational cognition. The negative aspects of Tousi's vision towards things expresses that errors do not occur among feeling that is related to outward attention, because visions are limited to getting placed in the middle of the sight. But the positive aspect of  his opinion expresses that errors are just related to sensational knowledge and the judgments made by the wisdom which is earned under the influence of the imaginary power. In the other words, the stems of errors in the senses and sensational matters are in tangible matching with the outward reality that this action is just placed among the borders of wisdom.