Plays a role in neurite development. May play a specific role in the control of eye movement and gaze stability. Defects in FRMD7 are the cause of nystagmus congenital X- linked type 1 (NYS1). NYS1 is a condition defined as conjugated, spontaneous and involuntary ocular oscillations that appear at birth or during the first three months of life. Other associated features may include mildly decreased visual acuity, strabismus, astigmatism, and occasionally head nodding. 2 isoforms of the human protein are produced by alternative splicing. Note: This description may include information from UniProtKB.