PT  - JOURNAL ARTICLE
AU  - Augusto Azuara-Blanco
AU  - Tahera K Bhojani
AU  - Abdul R Sarhan
AU  - C T Pillai
AU  - Harminder S Dua
TI  - Tono-Pen determination of intraocular pressure in patients with band keratopathy or glued cornea
AID  - 10.1136/bjo.82.6.634
DP  - 1998 Jun 01
TA  - British Journal of Ophthalmology
PG  - 634--636
VI  - 82
IP  - 6
4099  - http://bjo.bmj.com/content/82/6/634.short
4100  - http://bjo.bmj.com/content/82/6/634.full
SO  - Br J Ophthalmol1998 Jun 01; 82
AB  - AIMS To evaluate the intraocular pressure (IOP) measurements in patients with band keratopathy or glued corneas obtained from affected and non-affected areas. METHODS 15 patients with band keratopathy or glued corneas were prospectively recruited. When both eyes were affected, only the right eye was analysed. Tono-Pen readings of IOP were obtained sequentially from the affected and non-affected corneal surface. Additionally, Goldmann applanation tonometry was attempted. RESULTS Determination of IOP with the Tono-Pen was possible in all cases, while Goldmann tonometry was not performed in three patients because of severe corneal irregularities. The average of the Tono-Pen readings obtained from the affected cornea (34.8 (SD 14.0) mm Hg) was consistently and significantly higher (p<0.001) than mean IOP obtained by the Tono-Pen from the non-affected area (14.8 (4.3) mm Hg). The average of Goldmann tonometry readings (14.4 (6.1) mm Hg) did not differ significantly from the Tono-Pen values obtained from the non-affected corneal area (p=0.47) but was significantly lower than the Tono-Pen measurements obtained from the affected area (p<0.001) CONCLUSION In patients with band keratopathy or glued corneas determination of IOP by Tono-Pen tonometry varies from affected to non-affected area. The Tono-Pen overestimates the level of IOP when it is applied to areas with band keratopathy or with glue.