Coloboma of inferior eyelid is a rare developmental defect that affects the lower eyelid. It presents as a gap or notch that can vary in size from a small indentation to a complete absence of the lid, and the defect is typically triangular with its base at the eyelid margin. The condition results from disturbances in normal embryonic development of the eyelid and can occur in one or both eyes, either in isolation or alongside other facial anomalies such as clefting. Although the precise causes have not been firmly established, the absence of a defined genetic link indicates that a combination of complex genetic and environmental factors may contribute. Detailed prevalence data is not available, reflecting the rarity and variable presentation of the condition.

Individuals with coloboma of inferior eyelid typically exhibit a noticeable defect in the lower eyelid. The defect, often triangular in shape and most commonly located on the lateral third of the eyelid, can be either unilateral or bilateral and may range from a minor notch to a full-thickness absence of the eyelid. In some cases, the abnormality is the sole clinical finding, while in other instances it may be associated with additional facial anomalies such as clefting. The appearance of this structural defect often leads to early clinical evaluation, particularly when it impacts ocular protection or causes cosmetic concerns. Not all individuals experience all features, and the severity of the defect varies considerably between cases.

The precise genetic basis for coloboma of inferior eyelid has not been determined, and current evidence suggests that the condition may result from complex genetic and environmental factors during embryogenesis. No specific gene mutations have been identified, and there is no established inheritance pattern based on available data. As a result, the condition is generally considered to occur sporadically without a clear familial recurrence. Families with concerns about recurrence or related issues are encouraged to seek genetic counseling to explore potential contributing factors and receive personalized guidance.