Development of the axial length of cat eyes was monitored through A-scan ultrasonography at various times after neonatal monocular lid suture. In every case the deprived eye was longer than its fellow eye. Upon reestablishment of the palpebral fissure, refractive state and corneal curvature were recorded. Although all the deprived eyes showed axial elongation, there was no consistent relationship between neonatal lid fusion and the degree of myopia.