Axial length measurements before and after removal of silicone oil: a new method to correct the axial length of silicone-filled eyes for optical biometry

Background. The article presents results of axial length (AL) measurement in eyes filled with silicone oil and in those without silicone oil with IOLMaster and Lenstar LS 900 optical biometry methods. Materials and methods. The anteroposterior axis was measured in 27 eyes of 27 patients with silicone oil tamponade after surgical treatment of several vitreoretinal conditions. Using IOLMaster, the AL of eyes without silicone oil tamponade varied from 21.99 mm to 29.38 mm, Lenstar LS 900 biometry gave results from 21.96 mm to 29.41 mm. Results. According to data obtained and to their distribution, all cases were divided into 2 groups: I group — eyes with AL less than 23.63 mm, and II group — eyes with AL more than 23.63 mm. In the group II, the disparity of consecutive measurements was reliable and amounted to 0.28 ± 0.46 mm (р = 0.024) for IOLMaster and 0.23 ± 0.44 mm (р = 0.029) for Lenstar LS 900. Conclusion. So AL values at IOLMaster and Lenstar LS 900 biometry of silicone oil filled eyes may significantly overestimate the real ones when exceeding 23.63 mm. In case of simultaneous phacoemulsification with IOL implantation, this could lead to hypermetropic shift of postoperative refraction. Lenstar LS 900 measurement error in silicon oil filled eyes is less than that of IOLMaster, thus making the first biometry method preferable. In eyes with AL shorter than 23.63 mm, the measurement difference was not reliable, thus the biometry accuracy in silicone oil filled “short” eyes becomes higher.

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The Plasmin Inhibitors of Plasma

Thrombosis and Haemostasis ◽

10.1055/s-0038-1655579 ◽

1964 ◽

Vol 12 (01) ◽

pp. 119-125 ◽

Cited By ~ 9

Author(s):

Y Shamash ◽

A Rimon

Keyword(s):

Human Plasma ◽

New Method ◽

Normal Amount ◽

Caseinolytic Activity ◽

Before And After ◽

Plasmin Inhibitors

SummaryA new method for the assay of plasmin inhibitors in human plasma is described. The method consists of determination of the caseinolytic activity of a standard plasmin solution before and after incubation with the inhibitor, with lysine added to the mixture as a stabilizer of plasmin. Using this method, it was found that plasma contains enough inhibitors to inactivate 30 caseinolytic units of plasmin, or 10 times the normal amount of plasminogen in human plasma.

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Assessment of Color Stability of Treated Leathers with Silicone Oil and Polyethylene Glycol

Journal of African Leather and Leather Products Advances ◽

10.15677/jallpa.2014.v1i1.8 ◽

2014 ◽

Vol 1 (1) ◽

pp. 24-34

Author(s):

Alireza K. ◽

Hossein Ahmadi ◽

Mohsen Mohammadi

Keyword(s):

Ascorbic Acid ◽

Polyethylene Glycol ◽

Treatment Process ◽

Color Change ◽

Silicone Oil ◽

Accelerated Aging ◽

Color Stability ◽

Antioxidant Additive ◽

Before And After ◽

Aesthetic Values

Lubricants and leather dressings are the most common treatments of dry and water logged historical leathers. Color change has a great importance during the time and treatment process, due to visual and aesthetic values of historic leather relics. Polyethylene glycol (PEG) and silicone oil (SiO) are frequently used leather dressings in the conservation procedures. Therefore, color stability of treated leathers with PEG and SiO were investigated before and after heat accelerated aging. Moreover, application of ascorbic acid was evaluated as an antioxidant additive for PEG (PEG+AA).Color change after treatment and aging were studied by colorimetry technique in the CIE *L*a*b system. Results indicated to severe color alteration in PEG treated and aged leathers with or without ascorbic acid. Whereas, SiO treated samples showed better stability and minimum color shift after aging. Silicone oil was characterized as the best dressing for historical leathers with compared to PEG and PEG+AA, due to its high stability and aesthetical properties.

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Three-dimensional analysis of the root canal preparation with Reciproc Blue®, WaveOne Gold® and XP EndoShaper®: a new method in vivo

BMC Oral Health ◽

10.1186/s12903-021-01450-1 ◽

2021 ◽

Vol 21 (1) ◽

Author(s):

Javier Caviedes-Bucheli ◽

Nestor Rios-Osorio ◽

Diana Usme ◽

Cristian Jimenez ◽

Adriana Pinzon ◽

...

Keyword(s):

3D Reconstruction ◽

Root Canal ◽

Paired Comparison ◽

Three Dimensional ◽

New Method ◽

Root Canal Preparation ◽

Paired Data ◽

Before And After ◽

Student’S T

Abstract Background The purpose of this study was to evaluate the changes in canal volume after root canal preparation in vivo with 3 different single-file techniques (Reciproc-Blue®, WaveOne-Gold® and XP-EndoShaper®), with a new method using CBCT and 3D reconstruction. Methods In this prospective study, thirty human lower premolars from healthy patients were used, in which extraction was indicated for orthodontic reasons. All the teeth used were caries- and restoration-free with complete root development, without signs of periodontal disease or traumatic occlusion, and with only one straight canal (up to 25º curvature). Teeth were randomly divided into three different groups: Reciproc-Blue, WaveOne-Gold and XP-EndoShaper. CBCT scans before root canal preparation were used to create a 3D reconstruction with RHINOCEROS 5.0 software to assess the initial canal volume, and then compared with 3D reconstructions after canal preparation to measure the increase in canal volume. Student’s t test for paired data were used to determine statistically significant differences between the before and after canal volumes. Anova test was used to determine statistically significant differences in the percentage of canal volume increase between the groups and Tukey's post-hoc test were used to paired comparison. Results Reciproc-Blue showed the higher increase in canal volume, followed by WaveOne-Gold and XP-EndoShaper (p = 0.003). XP-EndoShaper did not show a statistically significant increase in canal volume after root canal preparation (p = 0.06). Conclusion With this model, Reciproc-Blue showed higher increase in root canal volume, followed by WaveOne-Gold, while XP-EndoShaper did not significantly increase root canal volume during preparation.

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“Yokoyama procedure” efficacy on non-highly myopic patients with acquired esotropia and hypotropia

European Journal of Ophthalmology ◽

10.1177/1120672119850684 ◽

2019 ◽

Vol 30 (4) ◽

pp. 676-679

Author(s):

Massimiliano Serafino ◽

Matteo Scaramuzzi ◽

Edoardo Villani ◽

Paolo Nucci

Keyword(s):

Magnetic Resonance Imaging ◽

Magnetic Resonance ◽

Axial Length ◽

Lateral Rectus ◽

Inclusion Criteria ◽

Resonance Imaging ◽

Spherical Equivalent Refraction ◽

Before And After ◽

Weighted Magnetic Resonance Imaging ◽

The Mean

Objective: To assess the efficacy of “Yokoyama Procedure,” on non-highly myopic patients with acquired esotropia and hypotropia. Methods: The study involved 10 eyes of 5 patients with eso-hypotropia. Inclusion criteria were acquired esotropic-hypotropic strabismus with lateral rectus inferior displacement and superior rectus nasal displacement confirmed by magnetic resonance imaging, refractive errors between ±6 D, and axial length < 27 mm. Range of full duction movements and maximum angles of abduction-sursumduction was measured in each eye before and after surgery. All patients underwent T1- and T2-weighted magnetic resonance imaging. The surgery was aimed at creating a junction between the muscle bellies of the superior and lateral rectus muscles. This junction was made approximately 14 mm behind the insertions using a non-absorbable mersilene 5/0 suture (Yokoyama procedure). Results: Mean patient age was 64.8 ± 4.8 years. The mean globe axial length was 25.4 ± 0.76 mm and a mean corresponding spherical equivalent refraction of −3.7 ± 1.7 D was observed. Eight eyes on 10 had mild limitation in abduction, while the remaining 2 had no limitation. Three out of 10 eyes showed a moderate limited sursumduction, 5 eyes were categorized as mild, and the remaining 2 had no limitation. No evident post-operative limitation was present in any eye, in both abduction and sursumduction (p < 0.01). Pre-operative esotropia and hypotropia were, respectively, 32 ± 11 prismatic diopters and 25 ± 5 prismatic diopters, and they were significantly reduced after surgery as 9 ± 1.7 prismatic diopters and 6 ±1 prismatic diopters (p = 0.043), respectively. Conclusion: Yokoyama procedure is an effective, fast, reversible procedure to face eso-hypotropic acquired strabismus, even in patients with a clear magnetic resonance imaging displacement of superior and lateral rectus muscles, and absence of globe dislocation and of elevated myopia.

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The accuracy of axial length measurements in cases of macula-off retinal detachment

Canadian Journal of Ophthalmology ◽

10.1016/j.jcjo.2015.12.011 ◽

2016 ◽

Vol 51 (2) ◽

pp. 108-112 ◽

Cited By ~ 8

Author(s):

Mohsen Abou-Shousha ◽

Hany Ahmed Helaly ◽

Ihab Mohamed Osman

Keyword(s):

Retinal Detachment ◽

Axial Length ◽

Length Measurements

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Impact of Valsalva Maneuver on Central Choroid, Central Macula, and Disk Fiber Layer Thickness Among High Myopic and Hyperopic Patients

European Journal of Ophthalmology ◽

10.5301/ejo.5000834 ◽

2016 ◽

Vol 27 (3) ◽

pp. 331-335 ◽

Cited By ~ 1

Author(s):

Isil Kurultay-Ersan ◽

Sinan Emre

Keyword(s):

Axial Length ◽

Choroidal Thickness ◽

Valsalva Maneuver ◽

Significant Negative Correlation ◽

Macular Thickness ◽

Enhanced Depth Imaging ◽

Central Macular Thickness ◽

Fiber Layer ◽

Rnfl Thickness ◽

Before And After

Purpose To evaluate the alterations in mean central choroidal, central macular, and disk retinal nerve fiber layer (RNFL) thickness measured by optical coherence tomography (OCT) during Valsalva maneuver among patients with high refractive errors. Methods A total of 60 high myopic (≥-6.0 D) and 50 high hyperopic (≥ + 3.0 D) eyes of 58 patients aged 19-65 years with visual acuity of 20/20 and without any ophthalmologic or systemic diseases were evaluated by OCT before and after the Valsalva maneuver. The choroidal thickness was measured with enhanced depth imaging OCT method. Central macular thickness, disk RNFL thickness, and axial length were also assessed. Results Mean choroidal thickness increased significantly from 275.0 ± 27.2 μm at rest to 279.8 ± 31.6 μm after Valsalva maneuver in high myopic patients, and from 308.2 ± 27.3 μm to 313.6 ± 28.5 μm in high hyperopic patients (p<0.01 for each). A significant negative correlation of the choroidal thickness was noted with axial length (r = -0.509, p<0.01) and age (r = -0.224, p = 0.01) in the overall study population. Mean central macular thickness was 242.9 ± 44.4 μm and 254.0 ± 22.8 μm, while mean disk RNFL thickness was 81.6 ± 12.4 μm and 98.4 ± 13.3 μm in high myopic and hyperopic patients, respectively. Valsalva maneuver was not associated with significant change in central macular or disk RNFL thickness. Conclusions Significant association of Valsalva maneuver with an increase in choroidal thickness was noted among patients with high degree of myopia and hyperopia. Our findings emphasize the likelihood of increase in choroidal volume due to venous distension to be responsible for the increase observed in choroidal thickness after Valsalva maneuver.

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