This paper will for your case

Analysis of the Drosophila compound eye with light and electron microscopy.

Mishra M, Knust E.

Methods Mol Biol. 2013;935:161-82. doi: 10.1007/978-1-62703-080-9_11.

Hi Giulia,

probably you want to try the line OK371 reported in the paper: http://dx.doi.org/10.1016/j.modgep.2005.07.006

the line is available in bloomington with the stock number 26160

http://flystocks.bio.indiana.edu/Reports/26160.html

Probably you want to cross it with GPF or other reporter and either visualize it in vivo or after IHC.

Good luck!

Abud

Really really useful, thanks a lot!