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مقاله
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Abstract
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Title:
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Corneal biomechanics changes after Rigid Gas Permeable contact lens fitting in keratoconus eyes
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Author(s):
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Fereshteh Shokrollahzadeh MS, Hassan Hashemi MD, Ebrahim Jafarzadehpur PhD, Mehdi Khabazkhoob PhD, Soheila Asgari MS
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Presentation Type:
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Oral
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Subject:
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Cornea and Anterior Segment
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Others:
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Presenting Author:
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Name:
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Fereshteh Shokrollahzadeh
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Affiliation :(optional)
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1. Department of Optometry, Iran University of Medical Sciences, Tehran, Iran
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E mail:
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f.shokrollahzadeh@gmail.com
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Phone:
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09128151471
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Mobile:
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09128151471
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Purpose:
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Evaluation of the corneal biomechanical properties three months after using the Rigid Gas Permeable (RGP) contact lens in keratoconus eyes.
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Methods:
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biomechanical response of 32 keratoconic eyes with a negative history of using the RGP lens were evaluated by Ocular Response Analyzer (ORA) and Corneal Visualization Scheimpflug Technology (CORVIS) corneal hysteresis (CH), corneal resistance factor (CRF), deformation amplitude (DA), and velocity in applanation 1 (V1) and applanation 2 (V2) were evaluated before and three months after fitting the aspheric RGP lens. The effect of the correlation between the left and the right eye and maximum keratometry were controlled for analysis. The results were compared using repeated measure analysis of covariance.
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Results:
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Three months after using the contact lens, the increase in CH (0.14±2.77mmHg, P=0.105), the increase in CRF (0.41±4.35mmHg, P=0.214), the decrease in DA (0.03±0.17mm, P=0.371), and the increase in V1 (0.03±0.17m/s, P=0.671) and V2 (0.11±0.59m/s, P=0.242) were not significant.
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Conclusion:
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Lack of significant changes in corneal biomechanical parameters three months after using the RGP lens may indicate non progression of keratoconus in the three months term as a result of using the RGP lens. Therefore, the use of the RGP lens can be regarded safe and appropriate in keratoconic patients.
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Attachment:
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