No mutation has been detected in the inaE coding sequence.
The size of the eyes and cross-sectional area of rhabdomeres is significantly smaller than normal in mosaic flies in which the eyes are homozygous (made using the "EGUF/hid" method). The mutant ommatidia are less ordered in their arrangement than normal and many contain less than the normal complement of seven rhabdomeres.
The average resting potential of homozygous photoreceptors in mosaic flies is normal.