Expression of ttk69.PPDLS.AAAAS.Scer\UAS.T:Ivir\HA1 under the control of Scer\GAL4hs.2sev results in a rough eye phenotype. R7 cell development is blocked in approximately 13% of ommatidia and many ommatidia contain more than four outer photoreceptor cells. Expression of ttk69.PPDLS.AAAAS.Scer\UAS.T:Ivir\HA1 under the control of Scer\GAL4ey.PH disrupts eye development.