failure to initiate and/or complete closure of the transient gap in the ventral margin of the developing optic cup; fusion of the optic fissure begins with apposition of the inferior lips of the ventral-most optic cup and continues anteriorly toward its rim and posteriorly along the optic stalk; failure or late closure of the optic fissure prevents the establishment of normal fetal intraocular pressure and can result in microphthalmia associataed with colobomas
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