Introduction: Quite new on the Swedish market are orthokeratology lenses, used for both correction and myopia control. At the moment there are 22 practitioners in Sweden fitting orthokeratology lenses and 5 of those stands for 75 % of all fittings. Measuring the intraocular pressure in the eye is an important part of an eye- examination, because high intraocular pressure can result in glaucomatous changes. When using the orthokeratology lenses the corneal thickness changes, it decreases in the central epithelium and increases in the midperipheral stroma. The corneal thickness is affecting the intraocular pressure value. Aim: The aim of the study was to evaluate how the intraocular pressure, measured with a non-contact tonometer, changes when using orthokeratology lenses. Method: 7 people were fitted with orthokeratology lenses. The intraocular pressure was measured before using the lenses, after the first night, after the third night and after the seventh night. 12 eyes were measured after the tenth night, because of drop- out of two eyes. Result: Already after the first night a significant decrease in the intraocular pressure occurred with 1, 34 mm Hg (p= 0,049). Day ten the intraocular pressure had an average decrease of 2, 67 ± 2, 14 mm Hg, which was a significant change (p= 0, 002 ). Discussion: This study shows when wearing orthokeratology lenses a decrease in 2, 67 ± 2, 14 mm Hg at day 10 can be expected.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:hik-2280 |
| Date | January 2009 |
| Creators | Nilsson, Emelie |
| Publisher | Högskolan i Kalmar, Naturvetenskapliga institutionen |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Student thesis, info:eu-repo/semantics/bachelorThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
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