Intraocular pressure measurements and corneal biomechanical properties using a dynamic Scheimpflug analyzer, after several keratoplasty techniques, versus normal eyes

Hugo, J; Granget, E; Yin, G. Ho Wang; Sampo, M.; Hoffart, L.

doi:10.1016/j.jfo.2017.06.006

Cited by 13 publications

(11 citation statements)

References 24 publications

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“…Given all the previous facts, accurate assessment of IOP after keratoplasty is vital for to maintain functional graft. Goldman applanation tonometer (GAT) is the gold standard tool for IOP Nonetheless, after keratoplasty, surface irregularity and graft thickness as well as the astigmatism pose challenges for this apparently simple measure in practice, with no well-approved tool for this measure [21, 24–26].…”

Section: Discussionmentioning

confidence: 99%

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Corneal biomechanics and intraocular pressure assessment after penetrating keratoplasty for non keratoconic patients, long term results

et al. 2019

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Background To evaluate corneal biomechanical properties by the Ocular Response Analyzer (ORA) in non keratoconic patients underwent penetrating keratoplasty (PK). Methods Corneal hysteresis (CH), corneal resistance factor (CRF), Goldmann- correlated intraocular pressure (IOPg), cornea-compensated IOP (IOPcc) using the ORA, and central graft thickness (CGT) were measured in 30 eyes at least two years after penetrating keratoplasty for non keratoconic indications. IOP using the Goldmann applanation tonometer (GAT) was also obtained after compensation for graft thickness and astigmatism. Results The mean age of patients was 33.1 ± 10.13 years; indications for PK were herpetic corneal scar (53.3%), corneal stromal dystrophy (23.3%), traumatic corneal opacity (10%), chemical corneal opacity (6.7%), and Fuchs endothelial dystrophy (6.7%). Mean CH and CRF were 8.52 ± 1.81 mmHg, and 8.56 ± 1.59 mmHg, respectively. Mean CGT was 532.43 ± 30 μm. Mean IOP GAT, IOPg, and IOPcc were 11.88 ± 3.66, 14.64 ± 4.08, and 17.27 ± 4.60 mmHg, respectively ( P < 0.001). No significant association was found between CGT and IOP readings obtained using either the ORA or GAT. There were significant negative association between CH with both IOP GAT and IOPcc, while CRF had significant positive association with IOPg. Conclusion After penetrating keratoplasty for non keratoconic patients, graft biomechanics does not return to average values even 2 years after the operation; moreover, intraocular pressure measurement with ORA gives higher values than thickness compensated GAT.

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Section: Discussionmentioning

confidence: 99%

“…Anterior lamellar keratoplasty induces less changes in biomechanics when compared to PK. Building on this, IOP changes are expected to differ from those after PK [26, 29]. Scanning literature, a recent meta-analysis plotted the CBMs changes after PK & DALK including 750 eyes and 218 eyes in both groups respectively.…”

Section: Discussionmentioning

confidence: 99%

Corneal biomechanics and intraocular pressure assessment after penetrating keratoplasty for non keratoconic patients, long term results

et al. 2019

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“…Hugo et al claimed that the CT measurements were less reliable after lamellar keratoplasty due to interfaces and changes in the corneal shape. 4 We evaluated the correlation between IOP that was measured using a Tono-Pen and CT, and there was no correlation between them in the three types of surgery.…”

Section: Discussionmentioning

confidence: 99%

“…3 It is important to measure IOP accurately after keratoplasty because increased IOP can cause irreversible visual eld loss, endothelial cell loss, decreased vision, and graft failure due to endothelial dysfunction. 4 Both lamellar and penetrating keratoplasty procedures, which replace part of the recipient's corneal tissue with donor corneal tissue, may lead to signi cant anatomical changes to the cornea and anterior chamber structures. 5 Changes in the corneal thickness and curvature after corneal transplantation where corneal morphology is altered have an impact on IOP measurements.…”

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confidence: 99%

WITHDRAWN: Intraocular Pressure Changes Following Different Keratoplasty Techniques and Association with Cornea Parameters and anterior Chamber Depth

Gümüş¹,

Altan

Yıldırım

et al. 2021

Preprint

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Purpose To evaluate early intraocular pressure (IOP) changes following different keratoplasty techniques and to investigate the relationship between corneal thickness (CT), keratometry values, anterior chamber depth (ACD) and IOP changes. Methods We included patients who underwent penetrating keratoplasty (PK), deep anterior lamellar keratoplasty (DALK) and Descemet membrane endothelial keratoplasty (DMEK). ACD, CT, and keratometry measurements were repeated postoperatively at hour 24, week 1, and month 1. IOP measurements were repeated at postoperative hours 6 and 24, week 1, and month 1 by Tono-Pen XL. Results Twenty-two patients underwent PK, 12 patients underwent DALK, and 19 patients underwent DMEK. The difference between the IOP preoperatively and 6 hours postoperatively and between the IOP preoperatively and 24 hours postoperatively were statistically significant in the three types of surgery (p < 0.05 for each). The difference between preoperative and postoperative week 1 IOP was statistically significant only in the PK group (p = 0.023). When the IOP was compared between the three types of surgeries, the IOP at postoperative week 1 in the PK group was significantly higher than the DALK and DMEK groups (p = 0.021). There was no correlation between ACD, corneal thickness, K values, and IOP in any group. Conclusion IOP may increase in all types of keratoplasty during the first hours after surgery, but PK has a risk of high IOP longer in the early postoperative period. PK patients should be followed more carefully during postoperative week 1 to check for an increase in IOP.

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“…So far, ophthalmologists have conducted a series of comparisons involving patients with keratoconus [ 10 , 11 ] and diabetes [ 12 – 23 ], patients after surgery [ 24 ], and others [ 25 – 35 ]. In each case, only the parameters available in the original software of the Corvis tonometer were compared [ 5 , 36 – 39 ]. The search for the terms “Corvis tonometer” or “cornea deformation” in the database of Authormapper articles provides the results presented in Table 1 .…”

Section: Introductionmentioning

confidence: 99%

Corneal Vibrations during Intraocular Pressure Measurement with an Air-Puff Method

Koprowski

Wilczyński

2018

Journal of Healthcare Engineering

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Introduction The paper presents a commentary on the method of analysis of corneal vibrations occurring during eye pressure measurements with air-puff tonometers, for example, Corvis. The presented definition and measurement method allow for the analysis of image sequences of eye responses—cornea deformation. In particular, the outer corneal contour and sclera fragments are analysed, and 3D reconstruction is performed. Methods On this basis, well-known parameters such as eyeball reaction or corneal response are determined. The next steps of analysis allow for automatic and reproducible separation of four different corneal vibrations. These vibrations are associated with (1) the location of the maximum of cornea deformation; (2) the cutoff area measured in relation to the cornea in a steady state; (3) the maximum of peaks occurring between applanations; and (4) the other characteristic points of the corneal contour. Results The results obtained enable (1) automatic determination of the amplitude of vibrations; (2) determination of the frequency of vibrations; and (3) determination of the correlation between the selected types of vibrations. Conclusions These are diagnostic features that can be directly applied clinically for new and archived data.

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Intraocular pressure measurements and corneal biomechanical properties using a dynamic Scheimpflug analyzer, after several keratoplasty techniques, versus normal eyes

Cited by 13 publications

References 24 publications

Corneal biomechanics and intraocular pressure assessment after penetrating keratoplasty for non keratoconic patients, long term results

Corneal biomechanics and intraocular pressure assessment after penetrating keratoplasty for non keratoconic patients, long term results

WITHDRAWN: Intraocular Pressure Changes Following Different Keratoplasty Techniques and Association with Cornea Parameters and anterior Chamber Depth

Corneal Vibrations during Intraocular Pressure Measurement with an Air-Puff Method

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