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Abstract #6691 Published in IGR 4-1
Comparison of Goldmann, Tono-Pen IIR, and noncontact tonometer measurements in eyes after penetrating keratoplasty
Kaburaki A; Yamada M; Ohtake Y; Tanino T; Mashima YFolia Ophthalmologica Japonica / Nihon Ganka Kiyo 2001; 52: 641-646
PURPOSE: To study measurement of intraocular pressure (IOP) under difficult conditions, when the corneal surface is rough, by analyzing readings of IOP in eyes that had undergone penetrating keratoplasty. METHODS: Using three different types of tonometers (Goldmann tonometer (GAT), automated noncontact tomometer CT-10 (NCT), and Tono-Pen IIR (Tono)), the authors measured IOP in 56 eyes of 45 patients who had undergone penetrating keratoplasty. They then analyzed the IOP readings to determine how they might have been influenced by corneal thickness and corneal curvature. RESULTS: IOP could not be measured in six of the 56 eyes using GAT, nor in three eyes with NCT; however, there were no eyes in which IOP was not measurable with Tono. The mean IOP measured with the GAT was not statistically different from that measured with the NCT, whereas the mean IOP measured with Tono was statistically significantly higher than that measured with either GAT or Tono. The difference between IOPs measured with NCT and GAT was 2.3 ± 1.4 mmHg, and the difference between IOPs measured with Tono and GAT was 3.1 ± 2.3 mmHg. The differences in IOP values measured with the different tonometers appear to be influenced by corneal curvature and corneal deformability. CONCLUSIONS: These results suggest that IOP measured with GAT may be underestimated in postkeratoplasty eyes, so it is necessary to use several instruments to evaluate IOP after penetrating keratoplasty.
Dr. A. Kaburaki, Department of Ophthalmology, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan
Classification:
6.1 Intraocular pressure measurement; factors affecting IOP (Part of: 6 Clinical examination methods)
9.4.11.4 Glaucomas associated with corneal surgery (Part of: 9 Clinical forms of glaucomas > 9.4 Glaucomas associated with other ocular and systemic disorders > 9.4.11 Glaucomas following intraocular surgery)
