COMPARATIVE STUDY OF RNFL THICKNESS USING SPECTRAL DOMAIN OCT AND VISUAL FIELD ANALYSIS USING HUMPHREY FIELD ANALYSER IN CASES OF POAG

Purpose: To compare RNLF structural changes by Spectral Domain- OCT and functional visual eld defects by automated perimetry in Primary Open Angle Glaucoma cases Materials And Methods: A prospective and comparative study was conducted to quantitatively measure the peripapillary retinal nerve ber layer thickness using SD-OCT and compared it with eld changes plotted by Humphrey Field analyser 24-2. The study was conducted at the department of Glaucoma of a tertiary eye care hospital for a period of one year. 60 eyes of 30 patients who diagnosed to have POAG between the age group of 40-65 were included in the study. Patients having substantial media opacity, Retinal pathology and who underwent intra ocular surgeries were excluded from the study. Informed consent obtained from patients who were included in the study. All were examined using Slit lamp, Snellen's chart, Applanation tonometer, Gonioscope, 90 D slit lamp biomicroscope to study Fundus oculi. Fields were plotted using Humphrey eld analyser 24-2 , RNFL thickness measured using SD-OCT. Results: 60 eyes of 30 patients 19 were males 11 were females. 14(23.33%) eyes showed normal visual elds but there was thinning of RNFL was noted in SD-OCT. 41 eyes (68.3%) had visual eld defects which corresponded to thinning of RNFL in that quadrant. 5 eyes (8.3%) showed advanced eld changes and had corresponding thinning of RNFL in that quadrant. Discussion: Results of this study shows a signicant difference in RNFL thickness among all three grades of glaucoma. It was observed that the average RNFL thickness value in moderate glaucoma (66.34 microns) and all quadrant thickness values were similar to Sihota et al study (RNFL-66.07 microns). The mean RNFL thickness +/- Sd (58 +/-5.52) in advanced glaucoma of present study were closely similar with the ndings of Sihota et al study (53.65 +/-14.2). Conclusion: It is concluded that RNFL thickness changes corresponds to Field changes plotted on Humphrey eld analyser in moderate glaucoma. Even in mild cases changes RNFL thickness is noted even though the elds plotted on Humphrey eld analyser doesn't show any changes. So RNFL thickness can be taken as Pre perimetric changes as diagnostic criteria for the diagnosis of POAG.

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Application of Spectral Domain Optical Coherence Tomography to Objectively Evaluate Posterior Capsular Opacity In Vivo

Journal of Ophthalmology ◽

10.1155/2018/5461784 ◽

2018 ◽

Vol 2018 ◽

pp. 1-9 ◽

Cited By ~ 1

Author(s):

Shasha Yu ◽

Chengzhe Lu ◽

Xin Tang ◽

Xiaoyong Yuan ◽

Bo Yuan ◽

...

Keyword(s):

Visual Acuity ◽

Objective Evaluation ◽

Spectral Domain ◽

Posterior Capsular Opacification ◽

Slit Lamp ◽

Cross Sectional ◽

Spectral Domain Oct ◽

Posterior Capsular Opacity ◽

Sd Oct

Objectives. To objectively evaluate posterior capsular opacification (PCO) with RTVue-100 spectral domain-OCT and assess the agreement with the Pentacam system. Methods. Sixty-seven eyes diagnosed with PCO were included. RTVue-100 SD-OCT was used to scan the IOL outline and PCO at horizontal and vertical meridians. PCO was also imaged with a Pentacam and slit-lamp photography system. With RTVue-100 SD-OCT, the PCO area, thickness, density, and objective scores were recorded and used to evaluate the severity of PCO at 3 mm and 5 mm diameter ranges of the IOL optic region. We assessed the correlation of visual acuity, PCO characteristics, and PCO scores. PCO scores acquired from RTVue-100 SD-OCT images were also compared with those from the Pentacam. Differences between pear-type and fibrosis-type PCOs were also compared using RTVue-100 SD-OCT cross-sectional images. Results. The cross-sectional images of PCO acquired with RTVue-100 SD-OCT corresponded well to Pentacam and slit-lamp retroillumination images. IOL-posterior capsular space, area, thickness, and density of the proliferated and accumulated LECs could be clearly visualized and quantified with RTVue-100 SD-OCT. PCO scores were correlated with decreased visual acuity, which was in line with the outcomes using the Pentacam. Differences between the pear-type and fibrosis-type PCO were statistically significant; pear-type PCOs showed a wider and thicker opacification region with lower density compared with fibrosis-type PCOs. Conclusion. RTVue-100 SD-OCT could be a powerful tool in PCO objective evaluation and classification. OCT could be used to visualize the morphology and outline of PCO. Thus, it could discriminate and quantify differences between different types of PCO. PCO scores seem to be a useful factor that could reliably reflect PCO severity.

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Spectral-domain optical coherence tomography for evaluating palisades of Vogt in ocular surface disorders with limbal involvement

Scientific Reports ◽

10.1038/s41598-021-91999-2 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Ying-Yi Chen ◽

Yi-Chen Sun ◽

Chia-Ying Tsai ◽

Hsiao-Sang Chu ◽

Jo-Hsuan Wu ◽

...

Keyword(s):

Optical Coherence Tomography ◽

Ocular Surface ◽

Spectral Domain ◽

Optical Coherence ◽

Slit Lamp ◽

Ocular Rosacea ◽

Unilateral Disease ◽

Healthy Eyes ◽

Slit Lamp Biomicroscopy ◽

Sd Oct

AbstractSpectral-domain optical coherence tomography (SD-OCT) has been used to observe the morphology of the palisades of Vogt (POV) with satisfactory resolutions. In this study, we used SD-OCT to examine the microstructure of the POV in ocular surface disorders with limbal involvement. We detect subclinical limbal pathologies based on five parameters, including (1) decreased epithelial thickness, (2) loss of the sharp stromal tip, (3) loss of the smooth epithelial-stromal interface, (4) dilated stromal vessels, and (5) decreased POV density. Eighteen eyes of 10 patients with advancing wavelike epitheliopathy (AWE) and 15 eyes of 9 patients with phlyctenular keratitis/ocular rosacea were recruited. SD-OCT could detect abnormal changes in the POV in 100% of the lesion sites. In presumed-healthy areas of the diseased eyes diagnosed by slit-lamp biomicroscopy, SD-OCT detected abnormal changes in the POV in 100% of the eyes in both groups. In patients with unilateral disease, abnormal changes in the POV were detected by SD-OCT in 50% and 100% of presumed-healthy eyes diagnosed by slit-lamp biomicroscopy in the AWE group and phlyctenular keratitis/ocular rosacea group, respectively. SD-OCT is powerful in detecting POV changes in ocular surface disorders and can provide useful information that cannot be provided by slit-lamp biomicroscopy.

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Comparison of a commercial spectral-domain OCT and swept-source OCT based on an angiography scan for measuring circumpapillary retinal nerve fibre layer thickness

British Journal of Ophthalmology ◽

10.1136/bjophthalmol-2019-314706 ◽

2019 ◽

Vol 104 (7) ◽

pp. 974-979 ◽

Cited By ~ 2

Author(s):

Bingyao Tan ◽

Jacqueline Chua ◽

Thiyagrajan Harish ◽

Amanda Lau ◽

Alfred Tau Liang Gan ◽

...

Keyword(s):

Nerve Fibre ◽

Excellent Agreement ◽

Retinal Nerve Fibre Layer ◽

Spectral Domain ◽

Wide Field ◽

Swept Source ◽

Rnfl Thickness ◽

Fibre Layer ◽

Nerve Fibre Layer ◽

Sd Oct

Background/aimsTo assess the agreement in measuring retinal nerve fibre layer (RNFL) thickness between spectral-domain (SD; Cirrus HD, Carl Zeiss Meditec, USA) optical coherence tomography (OCT) and swept-source (SS; Plex Elite 9000, Carl Zeiss Meditec) OCT using an OCT angiography (OCTA) scanning protocol.Methods57 participants (12 glaucomatous, 8 ocular hypertensive and 74 normal eyes) were scanned with two OCT instruments by a single experienced operator on the same day. Circumpapillary RNFL thicknesses were automatically segmented for SD-OCT and manually segmented for SS-OCTA scans. Agreement of global RNFL thickness, as well as average thickness in four quadrants was assessed using intraclass correlation coefficients (ICCs).ResultsThere was excellent agreement in the inferior and superior quadrants and the global (all ICC >0.90), followed by good agreement in the temporal (ICC=0.79) and nasal (ICC=0.73) quadrants. The ICC values were similar in the subgroups except within the ocular hypertension group, where the nasal quadrant was less agreeable (ICC=0.31). SS-OCTA-derived RNFL thickness was on average 3 µm thicker than SD-OCT, particularly in the nasal (69.7±11.5 µm vs 66.3±9.3 µm; p<0.001) and temporal (75.6±13.7 µm vs 67.9±12.3 µm; p<0.001) quadrants.ConclusionsRNFL measurements taken with SS-OCTA have good-to-excellent agreement with SD-OCT, which suggests that the RNFL thickness can be sufficiently extracted from wide-field OCTA scans.

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Retinal Damage in Multiple Sclerosis Disease Subtypes Measured by High-Resolution Optical Coherence Tomography

Multiple Sclerosis International ◽

10.1155/2012/530305 ◽

2012 ◽

Vol 2012 ◽

pp. 1-10 ◽

Cited By ~ 21

Author(s):

Timm Oberwahrenbrock ◽

Sven Schippling ◽

Marius Ringelstein ◽

Falko Kaufhold ◽

Hanna Zimmermann ◽

...

Keyword(s):

Optical Coherence Tomography ◽

Optic Neuritis ◽

Large Scale ◽

Retinal Nerve Fibre Layer ◽

Spectral Domain ◽

Healthy Controls ◽

Optical Coherence ◽

Cross Sectional ◽

Spectral Domain Oct ◽

Rnfl Thickness

Background.Optical coherence tomography (OCT) has facilitated characterisation of retinal alterations in MS patients. Only scarce and in part conflicting data exists on different MS subtypes.Objective.To analyse patterns of retinal changes in different subtypes of MS with latest spectral-domain technology.Methods.In a three-centre cross-sectional study 414 MS patients and 94 healthy controls underwent spectral-domain OCT examination.Results.Eyes of MS patients without a previous optic neuritis showed a significant reduction of both retinal nerve fibre layer (RNFL) thickness and total macular volume (TMV) compared to healthy controls independent of the MS subtype (P<0.001for all subtypes). RNFL thickness was lower in secondary progressive MS (SPMS) eyes compared to relapsing-remitting MS (RRMS) eyes (P=0.007), and TMV was reduced in SPMS and primary progressive MS (PPMS) eyes compared to RRMS eyes (SPMS:P=0.039, PPMS:P=0.005). Independent of the subtype a more pronounced RNFL thinning and TMV reduction were found in eyes with a previous optic neuritis compared to unaffected eyes.Conclusion.Analysis of this large-scale cross-sectional dataset of MS patients studied with spectral-domain OCT confirmed and allows to generalize previous findings. Furthermore it carves out distinct patterns in different MS subtypes.

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Retinal Nerve Fiber Layer Imaging with Spectral-domain Optical Coherence Tomography (OCT)—A Review of the Cirrus HD-OCT

US Ophthalmic Review ◽

10.17925/usor.2011.04.01.12 ◽

2011 ◽

Vol 04 (01) ◽

pp. 12 ◽

Cited By ~ 1

Author(s):

Elaine To ◽

Dennis Lam ◽

Christopher Kai-shun Leung ◽

◽

...

Keyword(s):

Optical Coherence Tomography ◽

Nerve Fiber ◽

Retinal Nerve Fiber Layer ◽

Spectral Domain ◽

Optical Coherence ◽

Fiber Layer ◽

Nerve Fiber Layer ◽

Spectral Domain Oct ◽

Rnfl Thickness ◽

Retinal Nerve Fiber

High-speed, high-resolution imaging of the retinal nerve fiber layer (RNFL) with spectral-domain optical coherence tomography (OCT) has become an essential tool for evaluation of glaucoma. The Cirrus HD-OCT (Carl Zeiss Meditec, Inc. Dublin, CA) is a spectral-domain OCT that provides visualization of the distribution pattern and measurement of RNFL abnormalities in a 6x6mm2optic disc region. Analysis of the RNFL thickness deviation map—a color-coded map displaying areas of RNFL abnormalities—detects glaucoma with high sensitivity and specificity. Trend analysis of average and sectorial RNFL thicknesses, and event analysis of the RNFL thickness maps and the RNFL thickness profiles can be used to detect and follow diffuse and focal RNFL progression. RNFL measurement with spectral-domain OCT could provide important information for use in formulating treatment plans and evaluating disease prognosis in the management of glaucoma.

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Korrelation der quantitativen Metamorphopsiemessung und der zentralen Netzhautdicke bei diabetischem Makulaödem und altersassoziierter exsudativer Makuladegeneration

Klinische Monatsblätter für Augenheilkunde ◽

10.1055/s-0043-125080 ◽

2018 ◽

Vol 236 (07) ◽

pp. 877-884 ◽

Cited By ~ 2

Author(s):

Daniela Claessens ◽

Alexander K. Schuster

Keyword(s):

Spectral Domain ◽

Sich Eine ◽

Spectral Domain Oct ◽

Sd Oct

Zusammenfassung Hintergrund Zur Erfassung von Metamorphopsien steht im klinischen Alltag der Amsler-Test zur Verfügung. Dieser erfasst qualitativ Metamorphopsien, zur Quantifizierung von Metamorphopsien und als Verlaufskontrolle wurde der computerbasierte Test „AMD – A Metamorphopsia Detector®“ entwickelt. Das Ziel dieser Studie ist zu untersuchen, ob eine Korrelation zwischen zentraler Netzhautdicke (CRT, gemessen mittels Spectral Domain OCT) und quantifizierter Metamorphopsiemessung bei Patienten mit exsudativer altersassoziierter Makuladegeneration (AMD) und diabetischem Makulaödem (DMÖ) besteht. Material und Methoden 66 Augen von 66 Patienten (DMÖ: 19 [11 Männer, 8 Frauen; Alter 42 – 76 Jahre]; AMD: 47 [13 Männer, 34 Frauen; Alter 56 – 93 Jahre]) wurden in dieser explorativen Pilotstudie untersucht und in Hinblick auf das Vorliegen eines Makulaödems (zentrale 500-µm-Zone, Cirrus HD-OCT) klassifiziert. Bestkorrigierter monokularer Fernvisus (BCVA), Amsler-Test, Metamorphopsiemessung (AMD – A Metamorphopsia Detector) mit Angabe des Metamorphopsie-Index (MI), binokulare Ophthalmoskopie, SD-OCT mit Messung der zentralen Netzhautdicke (CRT) und ggf. Fluoreszenzangiografie wurden durchgeführt. Die Korrelation von CRT und MI wurde mittels Spearman-Korrelation geprüft. Ergebnisse BCVA bei DMÖ bzw. AMD betrug (logMAR) 0,27 (SD 0,3) bzw. 0,29 (SD 0,2). Bei Augen mit DMÖ zeigte sich eine Korrelation von MI und CRT mit rho = 0,88 (p < 0,001) und bei Augen mit AMD betrug rho = 0,56 (p < 0,001). Schlussfolgerung Die Korrelation von CRT und MI war bei DMÖ hoch und bei AMD moderat. Künftige Studien sollen untersuchen, ob sich die Metamorphopsiemessung zur Detektion einer Konversion in eine exsudative AMD eignet und ob dies eine Messung zur Verlaufskontrolle, ggf. als Selbsttest ermöglicht.

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Retinal Layers Changes in Human Preclinical and Early Clinical Diabetic Retinopathy Support Early Retinal Neuronal and Müller Cells Alterations

Journal of Diabetes Research ◽

10.1155/2013/905058 ◽

2013 ◽

Vol 2013 ◽

pp. 1-8 ◽

Cited By ~ 75

Author(s):

Stela Vujosevic ◽

Edoardo Midena

Keyword(s):

Diabetic Retinopathy ◽

Fundus Photography ◽

Retinal Ganglion ◽

Fiber Layer ◽

Exclusion Criteria ◽

Retinal Layers ◽

Spectral Domain Oct ◽

Rnfl Thickness ◽

Sd Oct ◽

Peripapillary Area

Purpose. To evaluate the changes in thickness of individual inner and outer macular and peripapillary retinal layers in diabetes.Methods. 124 subjects (124 eyes) were enrolled: 74 diabetics and 50 controls. Macular edema, proliferative diabetic retinopathy (DR), any intraocular treatment and refractive error>6diopters were the main exclusion criteria. Full ophthalmic examination, stereoscopic fundus photography, and spectral domain-OCT were performed. After automatic retinal segmentation (layering) in 5 layers, the thickness of each layer was calculated, and values compared among groups.Results. Thirty patients had no DR, 44 patients had non proliferative DR. A significant increase of inner plexiform and nuclear layers was found in DR eyes versus controls (P<0.001). A significant decrease (P<0.01) of retinal nerve fiber layer (RNFL) and at specific sites of retinal ganglion cell layer (P=0.02) was documented in the macula. In the peripapillary area there were no differences between diabetics and controls.Conclusions. Decreased RNFL thickness and increased INL/OPL thickness in diabetics without DR or with initial DR suggest early alterations in the inner retina. On the contrary, the outer retina seems not to be affected at early stages of DM. Automatic intraretinal layering by SD-OCT may be a useful tool to diagnose and monitor early intraretinal changes in DR.

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Assessment of Posterior Segment Using Spectral Domain OCT in Highly Myopic Eyes

The Open Ophthalmology Journal ◽

10.2174/1874364101711010334 ◽

2017 ◽

Vol 11 (1) ◽

pp. 334-345 ◽

Cited By ~ 1

Author(s):

Heba Radi AttaAllah ◽

Ismail Ahmed Nagib Omar ◽

Ahmed Shawkat Abdelhalim

Keyword(s):

Social Sciences ◽

Posterior Vitreous Detachment ◽

Spectral Domain ◽

Spherical Equivalent ◽

Spearman Correlation ◽

Spectral Domain Oct ◽

Full Thickness Macular Hole ◽

The Social ◽

Sd Oct

Purpose: Spectral Domain Optical Coherence Tomography (SD-OCT) was used to evaluate retinal and vitreo-retinal changes that occur in highly myopic patients. Methods: This prospective study included 472 eyes of 472 patients suffering from high myopia (> -6.00 D), between May 2012 and December 2015. All patients were examined, using Cirrus HD OCT (Zeiss Cirrus TM HD-OCT model 4000), to detect any retinal or vitreo-retinal interface abnormalities. All obtained data was analyzed using Statistical Package for the Social Sciences software version 17 (SPSS Inc, Chicago, IL, USA) and the paired two-sided t-test. Bivariate correlations were performed between different parameters using the Spearman correlation coefficient (r). Results: Mean spherical equivalent (MSE) was -13.11± 4.35D. Mean axial length (AL) was 28.5±1.62 mm. Posterior vitreous detachment (PVD) was the most frequent OCT finding; representing 33.4% of the cases, 13.7% of them were associated with macular traction. A statistically significant positive correlation was found between AL and MTM, full thickness macular hole, PVD with traction, and dome shaped macula (r = 0.49 and P = 0.001, r = 0.422 and P = 0.0001, r = 0.25 and P = 0.03, r=0.475, P=0.001 respectively) Conclusion: OCT is a valuable tool in detecting retinal and vitreo-retinal interface abnormalities in highly myopic eyes, and it can be used for follow up of those patients to avoid advanced retinal damage.

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Corneal and Epithelial Thickness Mapping: Comparison of Swept-Source- and Spectral-Domain-Optical Coherence Tomography

Journal of Ophthalmology ◽

10.1155/2021/3444083 ◽

2021 ◽

Vol 2021 ◽

pp. 1-6

Author(s):

Cristina Georgeon ◽

Ilanite Marciano ◽

Roxane Cuyaubère ◽

Otman Sandali ◽

Nacim Bouheraoua ◽

...

Keyword(s):

Optical Coherence Tomography ◽

Corneal Thickness ◽

Spectral Domain ◽

Lamellar Keratoplasty ◽

Optical Coherence ◽

Swept Source ◽

Epithelial Thickness ◽

Spectral Domain Oct ◽

Anterior Lamellar Keratoplasty ◽

Sd Oct

Objective. To compare the results and repeatability of the corneal thickness (CT) and epithelial thickness (ET) maps provided by Swept-Source-Optical Coherence Tomography with those of Spectral-Domain-OCT in normal eyes. Methods. 30 normal eyes of 30 patients were assessed by 3 trained operators with SS-OCT and SD-OCT. Results. The central and minimum ET obtained with both devices were correlated: central ET, r = 0.86, p < 0.05 ; minimum ET, r = 0.72, p < 0.05 . Compared with SD-OCT, SS-OCT tended to underestimate these figures by 1.4 and 1.9 μm on average. The central and minimum CT obtained with both devices were strongly correlated: central CT, r = 0.994, p < 0.05 ; minimum CT, r = 0.995, p < 0.05 . SS-OCT tended to overestimate these figures by 11 and 14 μm on average. Repeatability was good for both devices with a mean coefficient of variation of measurements <6% for ET and <2% for CT. Interoperator variability (standard deviation and COV) was significantly higher for SS-OCT than for SD-OCT for all local epithelial thicknesses and significantly lower for the central CT and several local corneal thicknesses, whereas no significant differences between both technologies were found for the central and minimum ET and the minimum CT. Conclusion. SS-OCT and SD-OCT provide reproducible measurements of CT and ET in normal corneas with a strong correlation between both technologies. However, both technologies are not interchangeable when the main thickness parameters (i.e., central and minimum CT and minimum ET) are used for diagnosing early keratoconus or calculating the expected residual stromal bed thickness before corneal refractive surgery or anterior lamellar keratoplasty.

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