The fluorescein stain is primarily used to identify corneal abrasions by highlighting irregularities on the cornea. While it may have other implications for eye health, it does not measure tissue, assess near vision, or screen for cataracts. In this context, fluorescein's primary purpose is clear. ;
The instillation of fluorescein stain is primarily used to identify corneal abrasions by highlighting abnormalities on the cornea. It is not used to measure eye tissue, assess near visual acuity, or screen for cataracts. Therefore, the correct answer is B. Identifies a corneal abrasion.
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