Displays locomotor activity rhythm with an approximately 24h period.

The eye is disorganised. Corneal hairs and red pigment granules are only present in the centre of the eye. The ocellar lenses are normal in size, but lack the bulge of the wild-type, and have small protuberances. There are no ocellar retinula cells. The lenses of the compound eye and ocelli are roughened with "corneal nipples".

The compound eye and ocellar lenses are distorted. Cornea, pseudocone, primary pigment cells and Semper cells are present and relatively normal, but rhabdomere caps are either absent or abnormal. The retina contains no differentiated photoreceptors, and is dominated by secondary pigment cells. The lamina is very disorganised. The ocellar lenses are normal in size and thickness, but they have unusual blebs on their surface and their is no evidence of a retina underneath the lens.

Flies have no electroretinogram or deep pseudopupil. The external morphology of the eye is in some disarray; corneal facets are fused, and corneal hairs are displaced, although corneal nipples are present. Semper cells and the pseudocones they secrete are present. Photoreceptor cells are completely absent. Most of the volume of the peripheral retina is occupied by pigmented glia. Remnants of the ocellar lenslets are observed in the ocellar area.

No ERG or deep pseudopupil in none/none flies. In the compound eye, corneal facets are fused and corneal hairs displaced, but corneal nipples are present. There is an all-glial cell mass in the peripheral retina and there are no rhabdomeres or optic cartridges as in the wild-type fly. In the ocellar area, only remnants of the ocellar lenslets can be observed. Resembles Gl mutants in regard to morphology of the compound eye (Harte and Kankel, 1982) and absence of an ERG.