Is the tono-pen accurate for measuring intraocular pressure in young children with congenital glaucoma?

Purpose: We sought to compare intraocular pressure (IOP) measurements by Perkins tonometer and Tono-Pen in young children with primary congenital glaucoma (PCG).

Methods: This was a retrospective comparative case series. We reviewed the clinical records of all children with primary congenital glaucoma who underwent examinations under general anesthesia at Soroka University Medical Center between January 1999 and July 2002.

[Primary congenital glaucoma].

Primary congenital glaucoma (PCG) is a rare genetic disease usually diagnosed during the first year of life. It occurs because of developmental anomalies of the chamber angle that prevents drainage of aqueous humor, thereby elevating intraocular pressure. Its incidence is 1 in 10,000 live newborns in Western societies and 1 in 1,200 live newborns in the Arab-Bedouin population of the Negev region in Israel.

High postdialysis urea rebound can predict intradialytic increase in intraocular pressure in dialysis patients with lowered intradialytic hemoconcentration.

Background: Intradialytic (ID) decrease in intraocular pressure (IOP) parallel to ultrafiltration-induced hemoconcentration has been recently reported. However, exacerbation of glaucoma in hemodialysis (HD) patients during HD sessions is occasionally observed. Postdialysis urea rebound (PDUR) is induced by the lag in urea removal from the cells to urea removal from the extracellular fluid, which when increased can result in ID drag of water to intracellular compartment.