What color is the light filter used in applanation tonometry?

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In applanation tonometry, a blue light filter is commonly used as part of the measurement process. This involves the use of a blue light source to illuminate the cornea and a blue filter to enhance contrast during observation. The blue filter is effective because it helps differentiate the reflectiveness of the cornea against the surrounding tissue, allowing for more accurate measurement of intraocular pressure by making the tear film and corneal surface easier to visualize. This use of color is part of ensuring that the tonometry readings are precise and reliable, which is crucial in assessing eye health, particularly in the diagnosis of glaucoma.

While other colors may have their applications in different contexts or methods, blue specifically serves a critical function in enhancing visibility and clarity during the tonometric assessment.

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