Simini Boards Cast
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Simini Boards Cast
Chapter 124 - Part C: The Ocular Surface Maintenance System
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In this BoardsCast episode, we continue Tobias Chapter 124 — Basic Ophthalmic Surgical Procedures with the framework that explains why an eye can look “structurally normal” and still ulcerate:
The eye doesn’t stay healthy because it has tears. It stays healthy because tears move.
This episode breaks ocular surface health into the three pillars that must run continuously:
- Production: the tear film is a 3-layer engineered product (aqueous, mucin, lipid) made by different “factories.” The nictitating membrane (third eyelid) gland contributes a major portion of aqueous tears—so cutting it out (old cherry eye approach) can create iatrogenic dry eye.
- Distribution: blinking is the delivery truck. You can have a normal Schirmer tear test and still get ulcers if the eyelid “wiper system” fails—especially with facial nerve paralysis causing lagophthalmos.
- Drainage: tears must exit through the nasolacrimal system. If drainage fails, tears overflow (epiphora), skin breaks down, and stagnant fluid becomes inflammatory and infectious.
We also cover the salvage concept for end-stage tear deficiency: parotid duct transposition—a compromise that replaces hydration using saliva, trading corneal survival for long-term mineral deposit management.
Key takeaway: Every corneal surface case is a supply-chain diagnosis: production, distribution, or drainage.
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