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Title: Audit on A-scan use prior to cataract surgery in Mater Dei Hospital
Authors: Agius, David
Buttigieg, Stefan
Giwa Amu, Obafemi
De Bono, Maria
Vella, Mario
Keywords: Eye -- Diseases -- Diagnosis
Eye -- Examination -- Malta
Cataract -- Surgery -- Malta
Issue Date: 2015
Publisher: Medical Portals Ltd.
Citation: Agius, D., Buttigieg, S., Giwa Amu, O., De Bono, M. & Vella, M. (2015). Audit on A-scan use prior to cataract surgery in Mater Dei Hospital. The Synapse, 14(3), 9
Abstract: The A-scan is a method of measurement of the ocular axial length (L). It is coupled with corneal curvature keratometry (K) readings so that one can measure the required power (P) of an intraocular lens (IOL) used for cataract surgery. The Sanders, Retzlaff and Kraft (SRK) formula calculates the required P of the IOL as P = A − 2.5L − 0.9K where A is the specific IOL constant. The power of the lens determines the refraction of the image onto the retina and thus determines the visual acuity of the eye. The axial length of the eye is measured by the time a signal takes to be reflected back to the source, like ultrasound or light. Distance is calculated by the velocity formula, depending on the speed of the signal. In Mater Dei hospital, two methods are used to determine the axial length of the eye prior to cataract surgery, namely an ultrasound method and an optical method.
Appears in Collections:The Synapse, Volume 14, Issue 3
The Synapse, Volume 14, Issue 3

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