Purpose: To investigate the corneal higher-order aberrations (HOAs) of the anterior and posterior corneal surfaces in eyes that underwent penetrating keratoplasty (PK), deep anterior lamellar keratoplasty (DALK), and Descemet stripping automated endothelial keratoplasty (DSAEK).
Design: Retrospective, case-control study.
Methods: study population: Twenty-four eyes underwent PK, 28 eyes underwent DALK, and 19 eyes underwent DSAEK; 29 normal eyes served as controls. observation procedures: The anterior and posterior corneal heights and pachymetric data were obtained with a Scheimpflug-based corneal topographer. Corneal HOAs for 4-mm pupils were calculated from the height data and were expanded with normalized Zernike polynomials. The HOAs resulting from the anterior and posterior corneal surfaces were compared among the procedures. main outcome measures: Anterior and posterior corneal HOAs (root mean square).
Results: Control eyes had significantly lower total HOAs and Zernike vector terms of the anterior and posterior surfaces than the other groups, except for spherical aberration. The mean anterior corneal surface total HOAs in the PK, DALK, DSAEK, and control groups were 1.38 ± 0.67 μm, 1.19 ± 0.57 μm, 0.61 ± 0.33 μm, and 0.21 ± 0.07 μm, respectively. The anterior corneal HOAs in the DSAEK group were significantly less than those in the PK group (P < .001) and DALK group (P < .001). The mean posterior corneal surface total HOAs were, respectively, 0.20 ± 0.09 μm, 0.24 ± 0.11 μm, 0.27 ± 0.15 μm, and 0.07 ± 0.02 μm. There were no significant differences in the posterior corneal HOAs among the treatment groups.
Conclusions: Because the refractive indices between the anterior and the posterior surfaces differed greatly, eyes that undergo DSAEK have lower anterior corneal HOAs compared with PK or DALK eyes. However, the anterior and posterior corneal HOAs in DSAEK eyes still were greater than those in control eyes.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.ajo.2011.06.027 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Purpose: This study aimed to elucidate the correlation between the degree of fat infiltration (FI) in thoracic paraspinal muscles and thoracic vertebral degeneration (TVD).
Methods: This cross-sectional study comprised 474 patients who underwent standard thoracic computed tomography (CT) scans. The FI was quantified as the percentage of adipose tissues within the cross-sectional area of thoracic paraspinal muscles.
Keyhole decompression surgery for holospinal epidural abscess: a novel approach for spinal stability preservation.
Eur Spine J
January 2025
Department of Orthopaedic Surgery, Graduate School of Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba, 260-8670, Japan.
Purpose: Spinal epidural abscesses are rare yet serious conditions, often necessitating emergency surgical intervention. Holospinal epidural abscesses (HEA) extending from the cervical to the lumbosacral spine are even rarer and present significant challenges in management. This report aims to describe a case of HEA with both ventrally-located cervical and dorsally-located thoracolumbar epidural abscesses treated with a combination of anterior keyhole decompression and posterior skip decompression surgeries.
View Article and Find Full Text PDFThe significance of ultrasound parameters and clinical factors in predicting successful labor induction among nulliparous women.
J Matern Fetal Neonatal Med
December 2025
Department of Obstetrics and Gynaecology, Riga Stradins University, Riga, Latvia.
Objectives: To compare the values of ultrasound and clinical parameters for predicting outcomes of induction of labor (IOL) among healthy nulliparous women with a singleton, term cephalic pregnancy.
Methods: The cervical length, cervical strain elastography, posterior cervical angle, head-perineum distance, Bishop score, and maternal parameters were assessed before IOL with a combined method-Foley catheter and Misoprostol perorally. The main outcome was vaginal delivery.
Optimal Planning Target Volume Margins to Account for Intra-Fractional Prostate Motion Relative to Treatment Duration: A Study Using Real-Time Transperineal Ultrasound Guidance.
J Med Imaging Radiat Oncol
January 2025
Department of Radiation Oncology, Townsville University Hospital, Townsville, Queensland, Australia.
Introduction: Prostate motion during external beam radiotherapy (EBRT) is common and typically managed using fiducial markers and cone beam CT (CBCT) scans for inter-fractional motion correction. However, real-time intra-fractional motion management is less commonly implemented. This study evaluated the extent of intra-fractional prostate motion using transperineal ultrasound (TPUS) and examined the impact of treatment time on prostate motion.
View Article and Find Full Text PDFRetrospective Evaluation of Combined Anterior and Posterior Surgery with Autologous Tricortical Iliac and Rib Bone Grafting for Severe Kyphotic Deformity in Thoracic Spinal Tuberculosis.
Neurochirurgie
January 2025
Department of Orthopedic Surgery, Panzhihua Central Hospital, Sichuan Province, Panzhihua City, 617067, China. Electronic address:
Background: Spinal tuberculosis is a common cause of spinal deformity and neurological dysfunction, with surgical treatment being crucial in severe cases. This study evaluates the efficacy and safety of combined anterior and posterior surgery with autologous tricortical iliac bone and rib grafting for treating spinal tuberculosis.
Methods: We included 61 patients with thoracic tuberculosis, who underwent a surgical procedure involving initial posterior correction, followed by anterior debridement and reconstruction with autologous tricortical iliac bone and rib grafts.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!