Entropion And Ectropion
Entropion is the turning inward of the eyelid margin. Unlike ectropion, it is symptomatic and injures the ocular surface. The patient seeks medical care early. Ectropion is an eyelid malposition in which the eyelid margin does not oppose the globe. We shall discuss the relevant anatomy and clinical examination for the two entities together. Relevant Anatomy The eyelid can be grossly divided into Anterior lamella composed of skin and orbicularis Posterior lamella composed of tarsus and conjunctiva Factors contributing to the stability of the lower eyelid Appropriate horizontal tension of the lower lid so that the eyelid is apposed to the eyeball. This is supplied by the medial and lateral canthal tendons. Lower lid retractors applying appropriate tension to the inferior margin of the tarsus, pulling the lower edge of the tarsus inferiorly, and thus preventing the lid margin from turning inward as in entropion, or outward as in ectropion. Synchronous movement of the inferior rectus and l
Dr. Roshmi Gupta · Dr. Rwituja Thomas · +1 other