Myosins are actin-based motor molecules with ATPase activity. Unconventional myosins serve in intracellular movements. Their highly divergent tails bind to membranous compartments, which are then moved relative to actin filaments. In the retina, plays an important role in the renewal of the outer photoreceptor disks. Plays an important role in the distribution and migration of retinal pigment epithelial (RPE) melanosomes and phagosomes, and in the regulation of opsin transport in retinal photoreceptors. In the inner ear, plays an important role in differentiation, morphogenesis and organization of cochlear hair cell bundles. Motor protein that is a part of the functional network formed by USH1C, USH1G, CDH23 and MYO7A that mediates mechanotransduction in cochlear hair cells. Required for normal hearing. Involved in hair-cell vesicle trafficking of aminoglycosides, which are known to induce ototoxicity (By similarity). Might homodimerize in a two headed molecule through the formation of a coiled-coil rod (By similarity). Identified in a complex with USH1C and USH1G (By similarity). Interacts with MYRIP (By similarity). Interacts with RPE65 (By similarity). Interacts with CIB2 (By similarity). May interact with CALM (By similarity). Interacts with WHRN (By similarity). Interacts with PLEKHB1 (via PH domain) (By similarity). Interacts with PCDH15 (By similarity). Interacts with TWF2 (By similarity). Interacts with USH1G (By similarity). Interacts with MYH9 (By similarity). Interacts (via MyTH4-FERM domains) with cytoplasmic regions of ADGRV1 and USH2A. Interacts with PDZD7 (via MyTH4-FERM domains) (By similarity). In the photoreceptor cells, mainly localized in the inner and base of outer segments as well as in the synaptic ending region (By similarity). In retinal pigment epithelial cells colocalizes with a subset of melanosomes, displays predominant localization to stress fiber-like structures and some localization to cytoplasmic puncta (By similarity). Detected at the tip of cochlear hair cell stereocilia (By similarity). The complex formed by MYO7A, USH1C and USH1G colocalizes with F-actin (By similarity). Belongs to the TRAFAC class myosin-kinesin ATPase superfamily. Myosin family. Represents an unconventional myosin. This protein should not be confused with the conventional myosin-7 (MYH7).