Interesting question, my gut feeling tells me that the "dull pain in eye" experienced may not be from RF radiation... but that would be a "gut feeling".
Exposure to RF radiation, and safety of RF radiation is very well documented by the FCC. Realizing that this is US based, and may or may not be applicable for other regions of the world.
The FCC FAQ can be found here: https://www.fcc.gov/engineering-technology/electromagnetic-compatibility-division/radio-frequency-safety/faq/rf-safety
The bullitin with formula's to calculate is the OET65, which can be found here: https://www.fcc.gov/general/oet-bulletins-line#65
Particular interesting is the example of document https://www.fcc.gov/Bureaus/Engineering_Technology/Documents/bulletins/oet65/oet65.pdf
Page 26 of the pdf-document (numbered as Page 21), lists an example of a 100MHz transmission at 10kW ERP power, experienced by someone standing 20 meters from the antenna-mast.
You can use this to calculate with your own numbers.
Another nice example would be the graph of "FIGURE-1 Power Density vs. Distance (assumes no surface reflection)" on Page 28 of the pdf (numbered as page 24). Which could be use for preliminary estimations of exposure
Furthermore, regulating bodies in various countries would have similar publications, it would be worthwhile checking this at your own discretion.