1. Dirt: During the use of an industrial endoscope, the lens may become dirty due to unavoidable factors such as corrosion and dust, affecting the image quality.

2. Lens problems: During the use of an industrial endoscope, if the lens is abnormal, such as damaged or loose, it will affect the image quality.

3. Environmental problems: If the industrial endoscope is used in an overly complex, dim, or disturbed environment, the lens image may become blurry.

4. Operational problems: Industrial endoscopes are high-precision inspection instruments and tools. If the operator lacks professional skills or experience, it may cause problems with the lens image quality.

To address these issues, the following solutions can be used to solve blurry industrial endoscope lens problems:

1. Regularly clean the lens and other components of the industrial endoscope to ensure that the environment and debris do not affect the image quality.

2. Replace or repair damaged lenses to ensure the integrity of the lens and the image quality.

3. Improve the working environment, such as adjusting lighting and reducing environmental interference, to enhance imaging quality.

4. Strengthen the professional skills and experience of on-site operators, or implement automated control technologies to reduce operator dependency.