Tonopen versus Goldmann applanation tonometry for detecting restrictive thyroid eye disease.

Purpose: In thyroid eye disease (TED), intraocular pressure (IOP) measurements are taken in both the primary and upgaze positions to elicit restrictive muscle disease. The aim of this study was to assess whether the IOP when measured with the eyes in upgaze (the Goldmann applanation tonometer [GAT] head applanating the inferior/peripheral cornea) is similar when compared with the central corneal IOP in upgaze using the Tono-Pen XL.

Methods: IOP was measured with the GAT on the central cornea in primary gaze and on the inferior cornea in upgaze.