| tyrosinase-negative (ty-neg) oculocutaneous a. |
a recessive disorder characterized by absence of pigment in hair, skin, and eyes. Signs include white hair throughout life, skin that is pink and highly susceptible to neoplasias, absence of pigmented nevi or freckles, gray to blue eyes, prominent red reflexes from the fundi, severe nystagmus, photophobia, and reduced visual acuity (most patients are legally blind). Called also albinism, a. I, and complete perfect a.
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