scholarly journals Corneal Densitometry in Different Grades of Myopia

2021 ◽  
Vol 1 (4) ◽  
pp. 206-213
Author(s):  
Dina Abdelazim ◽  
Rania Kamel ◽  
Hosam El-Deen El-Sharkawy ◽  
Amgad El Nokrashy
Keyword(s):  
Corneal Densitometry

scholarly journals Refractive outcome and tomographic changes after Descemet membrane endothelial keratoplasty in pseudophakic eyes with Fuchs’ endothelial dystrophy

2021 ◽  
Author(s):  
Bishr Agha ◽  
Nura Ahmad ◽  
Daniel G. Dawson ◽  
Thomas Kohnen ◽  
Ingo Schmack
Keyword(s):  
Central Corneal Thickness ◽  
Corneal Thickness ◽  
Corneal Astigmatism ◽  
Endothelial Keratoplasty ◽  
Descemet Membrane Endothelial Keratoplasty ◽  
Corneal Densitometry ◽  
Scheimpflug Imaging ◽  
Fuchs Endothelial Dystrophy ◽  
Posterior Corneal Astigmatism

Abstract Purpose To analyze refractive and topographic changes secondary to Descemet membrane endothelial keratoplasty (DMEK) in pseudophakic eyes with Fuchs’ endothelial dystrophy (FED). Methods Eighty-seven pseudophakic eyes of 74 patients who underwent subsequent DMEK surgery for corneal endothelial decompensation and associated visual impairment were included. Median post-operative follow-up time was 12 months (range: 3–26 months). Main outcome measures were pre- and post-operative manifest refraction, anterior and posterior corneal astigmatism, simulated keratometry (CASimK) and Q value obtained by Scheimpflug imaging. Secondary outcome measures included corrected distance visual acuity (CDVA), central corneal densitometry, central corneal thickness, corneal volume (CV), anterior chamber volume (ACV) and anterior chamber depth (ACD). Results After DMEK surgery, mean pre-operative spherical equivalent (± SD) changed from + 0.04 ± 1.73 D to + 0.37 ± 1.30 D post-operatively (p = 0.06). CDVA, proportion of emmetropic eyes, ACV and ACD increased significantly during follow-up. There was also a significant decrease in posterior corneal astigmatism, central corneal densitometry, central corneal thickness and corneal volume over time (p = 0.001). Only anterior corneal astigmatism and simulated keratometry (CASimK) remained fairly stable after DMEK. Conclusion Despite tendencies toward a hyperopic shift, changes in SE were not significant and refraction remained overall stable in pseudophakic patients undergoing DMEK for FED. Analysis of corneal parameters by Scheimpflug imaging mainly revealed changes in posterior corneal astigmatism pointing out the relevance of posterior corneal profile changes during edema resolution after DMEK.

Corneal densitometry in patients with keratoconus undergoing intrastromal Ferrara ring implantation

2021 ◽  
pp. 112067212110206
Author(s):  
Pablo Felipe Rodrigues ◽  
Bernardo Kaplan Moscovici ◽  
Guilherme Ferrara ◽  
Luciano Lamazales ◽  
Marcela Mara Silva Freitas ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Medical Records ◽  
Spherical Equivalent ◽  
Interventional Study ◽  
Data Comparison ◽  
Corneal Densitometry ◽  
Corrected Visual Acuity ◽  
Ring Segment ◽  
The Mean

Objective: Evaluation of central corneal densitometry changes following Ferrara corneal ring segment implantation in patients with keratoconus, especially the correlation between corneal densitometry and keratometry. Methods: Retrospective, non-comparative, interventional study based on the review of medical records of patients diagnosed with keratoconus who underwent Ferrara corneal ring segment implantation. Pre and post-operative corneal densitometry measurements obtained with Pentacam HR (Oculus, Wetzlar, Germany) were analyzed. The follow-up time was 3 months, and data comparison was made, using specific statistical analysis, with the data of 3 months postoperatively. Results: The study sample consisted of 43 eyes of 36 patients. The mean corrected visual acuity improved from 0.82 LogMAR preoperatively (SD ± 0.33) to 0.19 LogMAR (SD ± 0.13) postoperatively. The mean spherical equivalent varied from −4.63 (SD ± 3.94) preoperatively to −2.16 (SD ± 2.63) postoperatively. Asphericity varied from −0.69 (SD ± 0.32) preoperatively to −0.27 (SD ± 0.31) postoperatively. The mean maximum K was 54.01D (SD ± 3.38) preoperatively and 51.50D (SD ± 2.90) postoperatively. The mean anterior densitometric value was 18.26 (SD ± 2.03) preoperatively and 17.66 (SD ± 1.84) postoperatively. Conclusion: Corneal densitometry is an interesting technology that should be studied in keratoconus patients. Our results suggest that the corneal densitometry in the cornea’s anterior layer reduces after ICRS implantation and correlates with corneal keratometry. Further studies should be performed to increase the knowledge in this field.

Two-Year Course of Corneal Densitometry After Descemet Membrane Endothelial Keratoplasty

2017 ◽  
Vol 175 ◽  
pp. 60-67 ◽  
Author(s):  
Friederike Schaub ◽  
Philip Enders ◽  
Cornelius Bluhm ◽  
Björn O. Bachmann ◽  
Claus Cursiefen ◽  
...  
Keyword(s):  
Endothelial Keratoplasty ◽  
Descemet Membrane Endothelial Keratoplasty ◽  
Descemet Membrane ◽  
Corneal Densitometry

Corneal densitometry evaluation in archipelago keratitis

2013 ◽  
Vol 34 (1) ◽  
pp. 99-102 ◽  
Author(s):  
Faik Orucoglu ◽  
Serap Talaz ◽  
Ali Aksu ◽  
Orkun Muftuoglu
Keyword(s):  
Corneal Densitometry

scholarly journals Corneal Safety and Stability in Cases of Small Incision Lenticule Extraction with Collagen Cross-Linking (SMILE Xtra)

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Ihab Mohamed Osman ◽  
Hany Ahmed Helaly ◽  
Mohsen Abou Shousha ◽  
Amir AbouSamra ◽  
Islam Ahmed
Keyword(s):  
Visual Acuity ◽  
Cross Linking ◽  
Small Incision Lenticule Extraction ◽  
Distance Visual Acuity ◽  
Small Incision ◽  
Corneal Densitometry ◽  
Lenticule Extraction ◽  
Safety And Stability ◽  
Collagen Cross Linking

Purpose. To assess the safety and stability in cases of small incision lenticule extraction with collagen cross-linking (SMILE Xtra). Methods. This study was a retrospective interventional comparative study that included 60 eyes of 30 patients divided equally into two groups: SMILE Xtra and SMILE alone. The inclusion criteria were patients >18 years of age, myopic error >6 D, thinner cornea <520 microns, and abnormal corneal topography. Outcome data were recorded including uncorrected distance visual acuity and corrected distance visual acuity (UDVA and CDVA), manifest refraction spherical equivalent (MRSE), central corneal thickness, average keratometry, endothelial cell density, corneal resistance factor (CRF), and corneal densitometry. The follow-up period was 24 months. Results. There was a significant difference between the 2 groups regarding UDVA, CDVA, and MRSE at 1 month. In the SMILE Xtra group, 90% of eyes had postoperative UDVA of 20/20 and 97% had UDVA of 20/30 at 24 months. At 24 months, 26 eyes (87%) vs. 25 eyes (84%) were within ±0.50 D of attempted correction in SMILE Xtra and SMILE groups, respectively. Regarding stability, both groups showed improvement of MRSE at 1st month postoperatively and remained stable along the 24 months of follow-up. CRF and corneal densitometry were higher in the SMILE Xtra group along the whole follow-up period (p=0.001). Conclusion. Combining corneal cross-linking with SMILE procedure (SMILE Xtra) is a promising tool to prevent ectasia in high-risk patients. It is a safe and simple procedure that can be offered to patients undergoing SMILE with risk for ectasia. Trial registration no: PACTR201810577524718.

Comparison of corneal densitometry between big-bubble and visco-bubble deep anterior lamellar keratoplasty

2019 ◽  
Vol 104 (3) ◽  
pp. 336-340 ◽  
Author(s):  
Vincenzo Scorcia ◽  
Valentina De Luca ◽  
Andrea Lucisano ◽  
Donatella Bruzzichessi ◽  
Marco Balestrieri ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Lamellar Keratoplasty ◽  
Deep Anterior Lamellar Keratoplasty ◽  
Visual Outcomes ◽  
Corneal Densitometry ◽  
Group I ◽  
Anterior Lamellar Keratoplasty ◽  
Significant Difference ◽  
Viscoelastic Substance ◽  
Big Bubble

AimsTo evaluate deep corneal densitometry and visual outcomes after big-bubble (BB-DALK) and visco-bubble (VB-DALK) deep anterior lamellar keratoplasty performed in patients with keratoconus.MethodsProspective comparative study of 50 advanced keratoconic patients who underwent DALK surgery; 25 eyes (group I) were completed with BB-DALK and 25 eyes (group II) with VB-DALK after the failure of pneumatic dissection. Best spectacle-corrected visual acuity (BSCVA), corneal tomographic parameters and endothelial cell count were recorded 1, 3, 6, 12 and 24 months after surgery. Densitometric analysis of the deep corneal interface was obtained using Scheimpflug tomography at each visit; values recorded were compared between the two groups and statistically analysed.ResultsBSCVA was significantly better in the BB-DALK group than the VB-DALK group (0.39±0.29 vs 0.65±0.23 logarithm of the minimum angle of resolution, respectively) for the first 3 months; and in the same time period, densitometry was significantly higher in the VB-DALK group than those recorded in the BB-DALK group (23.97±5.34 vs 17.13±4.44 grayscale units). However, densitometric values and visual acuity did not differ significantly in the two groups at 1 year. No statistically significant difference for the other variables analysed at any time frame was found.ConclusionThe use of viscoelastic substance in the VB-DALK technique may induce modification of interface stromal reflectivity resulting in reduced visual acuity up to 3 months postoperatively. However, this initial negative effect on the interface quality does not affect the long-term visual outcome, with densitometric values and visual outcomes similar in the two groups from 6 months postoperatively.

scholarly journals The Effect of Corneal Thickness, Densitometry and Curvature on Intraocular Pressure Measurements Obtained by Applanation, Rebound and Dynamic Contour Tonometry

Vision ◽  
2020 ◽  
Vol 4 (4) ◽  
pp. 45
Author(s):  
Marco Antonio de Castro Olyntho Junior ◽  
Lucas Bertazzi Augusto ◽  
Carolina P. B. Gracitelli ◽  
Andrew J. Tatham
Keyword(s):  
Intraocular Pressure ◽  
Prospective Study ◽  
Corneal Thickness ◽  
Applanation Tonometry ◽  
Corneal Astigmatism ◽  
Dynamic Contour Tonometry ◽  
Pressure Measurements ◽  
Cross Sectional ◽  
Corneal Densitometry ◽  
The Relationship

Evaluate the effect of corneal thickness, densitometry and curvature on intraocular pressure (IOP) measurements obtained by Goldmann applanation tonometry (GAT), non-contact tonometry (NCT), rebound tonometry (RT), and dynamic contour tonometry (DCT). A cross-sectional prospective study involving 40 participants was performed. Corneal measurements were obtained using Pentacam (Oculus GMbH, Wetzlar, Germany), densitometry was measured at annuli of 0–2, 2–6, 6–10 and 10–12 mm. The relationship between corneal thickness (central, 4 and 6 mm), corneal astigmatism and corneal densitometry and IOP was examined. There was a significant relationship between corneal thickness (central, 4 and 6 mm) and GAT180, GAT90, RT, and NCT (P < 0.001 for all comparisons) but not for DCT. Higher corneal densitometry (6–10 mm and 10–12 mm zones) was associated with higher IOP from GAT180 and GAT90, and higher densitometry in the 6–10 mm zone correlated with higher IOP from NCT, however corneal densitometry increased with age. Accounting for age, the relationship between corneal densitometry and IOP measurements was not significant. In eyes with greater corneal astigmatism there was a greater difference between GAT90 and GAT180 measurements. IOP measurements may be affected by corneal thickness, densitometry and curvature. DCT was less affected by properties of the cornea compared to other devices.

scholarly journals Increased corneal densitometry as a subclinical corneal change associated with multiple myeloma

Eye ◽  
2017 ◽  
Vol 31 (12) ◽  
pp. 1745-1746 ◽  
Author(s):  
C Busch ◽  
S Koh ◽  
Y Oie ◽  
M Ichii ◽  
Y Kanakura ◽  
...  
Keyword(s):  
Multiple Myeloma ◽  
Corneal Densitometry

scholarly journals Diagnostic and Management Tool for Monitoring Patients Implanted with a Shape-Changing Corneal Inlay

2018 ◽  
Vol 9 (1) ◽  
pp. 190-196
Author(s):  
Ralph Chu ◽  
Briana R. Lee
Keyword(s):  
Postoperative Period ◽  
Management Tool ◽  
Corneal Densitometry ◽  
First Case ◽  
Corneal Inlay ◽  
Over Time

We report two cases that underwent corneal inlay implantation under a femtosecond flap. The first case had no complications during the postoperative period. Pentacam maps remained stable over time: corneal densitometry (CD) values had less than 2 units of change across visits up to 3 years. Axial/sagittal topography maps showed a stable Kmax (∼47 D), i.e., less than 1 D change between visits. The second case developed haze at 8 months postoperatively. CD increased by more than 4 units from 3 to 8 M and Kmax increased by 2.6 D. The patient was prescribed steroids and 1 month later the haze regressed, resulting in pre-haze CD and Kmax values, similar to the ones at 3 months.

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