Analysis of corneal biomechanical properties 25 years after myopic photorefractive keratectomy

Purpose To evaluate corneal biomechanical changes using Corvis ST in patients treated with photorefractive keratectomy (PRK) 25 years ago. Methods In this study, 32 post-PRK and 38 normal eyes underwent Corvis ST (CST) assessments. The measured CST factors were: time of highest concavity (HC), time...

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Bibliographic Details
Published in:International ophthalmology 2023-01, Vol.43 (1), p.325-331
Main Authors: Özdoğan, Sibel, Gürelik, Gökhan, Bilgihan, Kamil
Format: Article
Language:English
Subjects:
Adult
Biomechanical engineering
Biomechanical Phenomena
Biomechanics
Concavity
Cornea
Cornea - surgery
Dilatation, Pathologic
Evaluation
Health risks
Humans
Intraocular Pressure
Mechanical properties
Medicine
Medicine & Public Health
Middle Aged
Myopia - surgery
Ophthalmology
Original Paper
Photorefractive Keratectomy
Photorefractivity
Risk
Stiffness
Tonometry, Ocular
Velocity
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Summary:Purpose To evaluate corneal biomechanical changes using Corvis ST in patients treated with photorefractive keratectomy (PRK) 25 years ago. Methods In this study, 32 post-PRK and 38 normal eyes underwent Corvis ST (CST) assessments. The measured CST factors were: time of highest concavity (HC), time of applanation 1 (AT1), time of applanation 2 (AT2), length of applanation 1 (AL1), length of applanation 2 (AL2), velocity of applanation 1 (AV1), velocity of applanation 2 (AV2), deformation amplitude (DA), peak distance (PD), integrated radius (IR), Ambrosio relational thickness horizontal (ARTh), stiffness parameter at first applanation (SP-A1), DA ratio (2 mm), Belin/Ambrosio enhanced ectasia display (BAD) and corneal biomechanical index (CBI). Results The mean [± standard deviation (SD)] age was 51.4 ± 7.36 years in PRK, 51.4 ± 3.62 in control group. PRK was performed 24.69 ± 1.78 years ago. ARTh, SP-A1, AT1, AL1, and AL2 were lower in PRK. PD, AT2, DA ratio (2 mm), and IR were statistically higher in PRK ( P  
ISSN:1573-2630
0165-5701
1573-2630
DOI:10.1007/s10792-022-02436-w