The key is to apply to thin skin. So, technically, you could apply it to your eyelids, but I would not recommend it. Here in the U.S., prescription meds come with an information brochure about application sites. In the one that came with patches, there was detailed information about the studies they had done to determine the best site location and the benefits and drawbacks. I would follow the directions exactly.
You don't want to risk your health, then have a problem where you need to explain why you didn't follow the directions. When your lab tests are done, healthcare providers use the results to make adjustments. If you are using a product in a non-standard or non-recommended way, it could skew the results and give the providers misleading information. They can only work with the information they have available.
Don't play games with your health. When in doubt, follow the directions.