In mixed dry eye disease, evaporative dry eye disease (EDED) can lead to secondary aqueous-deficient dry eye (ADDE) through which sequence?

• A. Decreased tear stability leads to chronic ocular surface damage, resulting in reduced corneal sensation and diminished lacrimal secretion
• B. Increased tear production causing lipid layer disruption
• C. Primary ADDE without inflammation leads to EDED
• D. Ocular surface infection triggers gland dropout

Answer: (A)

Evaporative dry eye creates tear film instability that drives surface inflammation and damage. That chronic surface stress injures corneal nerves, reducing corneal sensation. With less neural input to the lacrimal system, parasympathetic drive to the lacrimal glands diminishes, leading to reduced aqueous tear production. In this way, the initial evaporative process can lead to secondary aqueous-deficient dry eye through a neural feedback loop that lowers lacrimal secretion. Other scenarios, like primary overproduction or infection-induced gland loss, don’t fit this sequence of surface damage → reduced corneal sensation → decreased lacrimal secretion.