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Keratometric variation during pregnancy and postpartum

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dc.contributor.advisor Prof. W. Harris ; Prof. J. Ferreira en_US
dc.contributor.author Klaassen, Donald Gregory Istvan
dc.date.accessioned 2012-08-27T12:21:48Z
dc.date.available 2012-08-27T12:21:48Z
dc.date.issued 2012-08-27
dc.date.submitted 1996
dc.identifier.uri http://hdl.handle.net/10210/6644
dc.description M.Phil. en_US
dc.description.abstract Keratometric readings on three subjects were taken both during pregnancy and postpartum. One subject was visually non-compensated and did not require refractive correction, one was a contact lens wearer and one had undergone radial keratotomy. Twenty readings were taken by means of an automatic keratometer on each eye, morning and afternoon, every fortnight. The recent matrix method of optometric statistical analysis was employed and the results graphically compared and analysed. Findings indicate diurnal variations including variation in corneal curvature and variance through the course of normal pregnancy. Most evident was an increase in keratometric variation in all three subjects at the time of birth and a substantial decrease in corneal refractive power in the subject who had before undergone radial keratotomy. This result may have far-reaching implications on the long term prognosis of refractive surgery especially for females of child bearing age. Outliers representing transient increases in curvature were most common in the vertical meridian (indicating possible lid interaction), while the presence of bimodal distributions suggests a sensitivity of the automatic keratometer to changes in head posture. en_US
dc.language.iso en en_US
dc.subject Eye - Accommodation and refraction en_US
dc.subject Eye - Accommodation and refraction - Statistical methods en_US
dc.subject Eye - Accommodation and refraction - Data processing en_US
dc.subject Pregnancy en_US
dc.title Keratometric variation during pregnancy and postpartum en_US
dc.type Thesis en_US

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