Ahmad M Mansour1, Randa S Haddad. 1. Department of Ophthalmology, American University of Beirut, Beirut, Lebanon. dr.ahmad@cyberia.net.lb
Abstract
PURPOSE: To examine the immediate effect of ocular rubbing on corneal topography. METHODS: Corneal topography and analysis were performed before, immediately after, and 5 minutes after eyelid rubbing in 29 volunteers without ocular disease. RESULTS: The surface regularity index increased from a baseline of 0.24 to 0.91 ( p< 0.0001) immediately after rubbing and returned to baseline after 5 minutes. The surface asymmetry index increased from 0.27 to 0.89 ( p= 0.0018) immediately after rubbing. There was a small amount of astigmatism induced immediately by rubbing (0.5 diopter) ( p= 0.01). CONCLUSIONS: Ocular rubbing should be avoided prior to standard corneal topography. The increased surface regularity index may reflect the alterations of the tear film and/or the molding of the corneal surface.
PURPOSE: To examine the immediate effect of ocular rubbing on corneal topography. METHODS: Corneal topography and analysis were performed before, immediately after, and 5 minutes after eyelid rubbing in 29 volunteers without ocular disease. RESULTS: The surface regularity index increased from a baseline of 0.24 to 0.91 ( p< 0.0001) immediately after rubbing and returned to baseline after 5 minutes. The surface asymmetry index increased from 0.27 to 0.89 ( p= 0.0018) immediately after rubbing. There was a small amount of astigmatism induced immediately by rubbing (0.5 diopter) ( p= 0.01). CONCLUSIONS: Ocular rubbing should be avoided prior to standard corneal topography. The increased surface regularity index may reflect the alterations of the tear film and/or the molding of the corneal surface.
Authors: Ahmad M Mansour; Anastasios G P Konstas; Hana A Mansour; Abdul R Charbaji; Khalil M El Jawhari Journal: Middle East Afr J Ophthalmol Date: 2021-04-30