1.Characteristics of Tear Lipid Layer Patterns on Tearscopy and Lipid Layer Thickness.
Journal of the Korean Ophthalmological Society 2000;41(10):2168-2173
This study is to evaluate thickness of lipid layer, NIBUT (non-invasive tear film break-up time), BUT and Schirmer value according to tearscopic pattern of lipid layer.The subjects are seventy-one eyes from seventy-one people without ocular diseases.The pattern of lipid layer is observed by Tearscope(r) (Keeler, U.K.)and the thickness of lipid layer is measured by interference generated from slit lamp microscope.The thickness of lipid layer, NIBUT and BUT are respectively measured three times and averaged.In the case of the pattern of lipid layer, eighteen eyes have the close meshwork type, twenty-nine eyes have the wave type, fifteen eyes have the amorphous type and nine eyes have the color fringe type.The average value of the thickness of lipid layer, NIBUT, BUT and Schirmer test were respectively 29.3 nm, 25.9 seconds, 12.0 seconds, 18.6 mm for close meshwork;47.2 nm, 33.6 seconds, 12.5 seconds, 16.9 mm for wave;66.2 nm, 39.7 seconds, 14.9 seconds, 18.7 mm for amorphous;and 74.4 nm, 30.9 seconds, 13.9 seconds, 18.9 mm for color fringe.The thickness of lipid layer was different significantly among the patterns.NIBUT showed significant difference between close meshwork and wave, and between close meshwork and amorphous.The Cronbach alpha, reproducibility of the test, is 0.84 in the thickness of lipid layer, 0.64 in NIBUT, 0.76 in BUT and 0.94 in Schirmer test.The reproducibility of the pattern of lipid layer observed by Tearscope(r) is 95.8%.
Tears*
2.Empirical study of alginate impression materials by customized proportioning system.
Karani KURTULUS ; Kenan TÜFEKCI
The Journal of Advanced Prosthodontics 2016;8(5):372-379
PURPOSE: Alginate mixers available in the market do not have the automatic proportioning unit. In this study, an automatic proportioning unit for the alginate mixer and controller software were designed and produced for a new automatic proportioning unit. With this device, it was ensured that proportioning operation could arrange weight-based alginate impression materials. MATERIALS AND METHODS: The variation of coefficient in the tested groups was compared with the manual proportioning. Compression tension and tear tests were conducted to determine the mechanical properties of alginate impression materials. The experimental data were statistically analyzed using one way ANOVA and Tukey test at the 0.05 level of significance. RESULTS: No statistically significant differences in modulus of elastisity (P>0.3), tensional/compresional strength (P>0.3), resilience (P>0.2), strain in failure (P>0.4), and tear energy (P>0.7) of alginate impression materials were seen. However, a decrease in the standard deviation of tested groups was observed when the customized machine was used. To verify the efficiency of the system, powder and powder/water mixing were weighed and significant decrease was observed. CONCLUSION: It was possible to obtain more mechanically stable alginate impression materials by using the custom-made proportioning unit.
Tears
3.Unsolved Legal Problems about Radiologic Characteristics of Traumatic Cuff Tears.
Clinics in Shoulder and Elbow 2015;18(4):195-196
No abstract available.
Tears*
4.Repeatability and Reproducibility of Tear Meniscus Evaluations Using Two Different Spectral Domain-optical Coherence Tomography
Jin Ha KIM ; Kyu Ryong CHOI ; Roo Min JUN ; Kyung Eun HAN
Journal of the Korean Ophthalmological Society 2019;60(10):929-934
PURPOSE: To evaluate the repeatability and reproducibility of inferior tear meniscus measurements using two different spectral domain-optical coherence tomography (OCT), and to compare the inter-device agreements between these devices. METHODS: Two examiners evaluated the tear meniscus depth (TMD) and tear meniscus height (TMH) of 20 eyes in 20 normal subjects using Cirrus OCT and Spectralis OCT with the examiners calculating the TMD and TMH. We analyzed intra-examiner repeatability, inter-examiner reproducibility, and inter-device agreement. RESULTS: The average TMD measurements using the Cirrus OCT and Spectralis OCT devices were 151.25 ± 41.53 µm and 139.10 ± 40.56 µm by examiner 1, respectively, and 152.03 ± 42.77 µm and 138.35 ± 39.70 µm by examiner 2, respectively. The TMHs were 291.90 ± 100.19 µm and 245.43 ± 66.44 µm by examiner 1, respectively, and 288.25 ± 98.72 µm and 244.23 ± 60.69 µm by examiner 2, respectively. The TMDs and TMHs measured using these OCT devices were not statistically significant for intra-examiner and inter-examiner measurements (all, p > 0.05). These devices showed high repeatability (intraclass correlation coefficient ≥ 0.991) for intra-examiner TMD and TMH measurements and the inter-examiner coefficient of variation ranged from 2.04% to 4.32%. The 95% limits of agreement between the two devices were −66.13 to 91.95 µm for TMD and −127.18 to 217.68 µm for TMH. CONCLUSIONS: Both OCT devices are useful for conducting inferior tear meniscus measurements. The inter-device agreement was poor, and the devices were not interchangeable.
Tears
5.Unsolved Legal Problems about Radiologic Characteristics of Traumatic Cuff Tears
Journal of the Korean Shoulder and Elbow Society 2015;18(4):195-196
No abstract available.
Tears
6.Wavefront Aberration Changes after the Instillation of Artificial Tear in Dry Eyes.
Kye Won CHOI ; Sang Woong MOON ; Myung Jin JOO
Journal of the Korean Ophthalmological Society 2006;47(2):186-191
PURPOSE: To identify the effects of artificial tear instillation on tear film changes using wavefront aberrations. METHODS: Artifical tear was instilled every 2 hours for 14 days into 20 normal eyes and 20 dry eyes. The changes in tear film using wavefront aberrations were analyzed 1 minute after the final instillation of artifical tear. RESULTS: In dry eyes, total wavefront aberration and total high order wavefront aberration decreased significantly (p<0.05). In normal eyes, total wavefront aberration and high order wavefront aberration did not decrease. CONCLUSIONS: Stabilization of the tear film after instillation of artificial tear may be responsible for the decrease of wavefront abberation in dry-eye patients.
Humans
;
Tears*
7.Secretion and Excretion of Tears in Normal Eyes of Korean.
Dong Sik YOU ; Hong Bok KIM ; Sang Yeul LEE
Journal of the Korean Ophthalmological Society 1987;28(1):1-7
The complaint of tearing may be due to 1) partial or complete obstruction of the excretory mechanism, 2) increased lacrimal secretion, or 3) decreased basic lacrimal secretion. So the physician should ascertain whether an excess of tears or obstruction of excretory mechanism is present. The most widely used tests for this purpose are the Schirmer test, Jones test and fluorescein dye disappearance test. The Jones test consist of Jones I test and Jones II test, which determine the functional and anatomical integrity of the lacrimal excretory system. In this study, Schirmer test, Jones test and fluorescein dye disappearance test were performed on 400 normal and 100 abnormal eyes to determine the secretion and excretion of tears.
Fluorescein
;
Tears*
8.Study on the tear production in elderly by shirmer test
Journal of Practical Medicine 2002;435(11):56-57
The tear production of 192 eyes was evaluated by shirmer I and 171 eyes were evaluated by shirmer II among 106 patients (male: 30). The results showed that the average value of total tear production in elderly was 8.7±6.6mm and average value of basic tear production was 6.1±4.3 mm. There was no difference of tear production was reduced with increased ages
Tears
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Aged
9.The Changes in Tear Film after Primary Pterygium Operation.
Journal of the Korean Ophthalmological Society 2013;54(11):1649-1654
PURPOSE: In this study we evaluated the changes in tear film after primary pterygium operation in patients with pterygium. METHODS: We investigated 43 eyes of 42 subjects who showed successful results 3 months after pterygium operation performed by one surgeon. The changes in tear film thickness, tear break-up time (BUT), Schirmer I test, and ocular surface disease index (OSDI) were evaluated. All values were compared before and after surgery. RESULTS: The mean age was 58.0 +/- 11.1 years (34-81 years). Preoperative tear film thickness, tear BUT, and Schirmer I test in eyes which underwent pterygium operation were 21.53 +/- 5.93 microm, 4.84 +/- 2.21 seconds, and 11.67 +/- 6.75 mm, respectively. Three months after the operation, the respective values were 24.23 +/- 4.19 microm (p < 0.05), 5.81 +/- 1.89 seconds (p < 0.05), and 13.02 +/- 7.54 mm (p = 0.094). Tear film thickness and BUT score increased significantly after pterygium operation. There was no statistically significant difference in Schirmer I test, before and 3 months after pterygium operation. The subjective parameter (OSDI) improved 3 months after pterygium operation (p = 0.015). CONCLUSIONS: Pterygium operation can partially restore the tear film function into a normal state by improving tear film thickness and tear BUT after pterygium operation.
Humans
;
Pterygium*
;
Tears*
10.Comparison of Changes in Ocular Surface Status after Wearing Orthokeratologic and Rigid Gas Permeable Lens.
Journal of the Korean Ophthalmological Society 2016;57(4):546-554
PURPOSE: To evaluate the differences in dry eye and meibomian gland dysfunction (MGD) by comparing ocular surface status before and after wearing an orthokeratologic (OK) lens and rigid gas permeable (RGP) lens made of the same material. METHODS: The ocular surface and meibomian gland statuses of 12 eyes of 12 OK lens wearers (OK lens group) and 16 eyes of 16 RGP wearers (RGP lens group) were evaluated before and 1 and 3 months after lens wearing. Ocular surface disease index (OSDI), tear film break-up time (TBUT), Schirmer's test I, and ocular surface staining score were evaluated for ocular surface parameters. Meibomian gland function was evaluated by assessing lid margin abnormality, meibomian gland expressibility, and meibum quality. RESULTS: TBUT and ocular surface staining score after 1 and 3 months of wearing an OK lens were significantly aggravated (p= 0.004, p < 0.001). The MGD grade, lid margin abnormality, meibomian gland expressibility, and meibum quality were aggravated after 1 and 3 months of wearing an OK lens (p < 0.001, p < 0.001, p < 0.001, p= 0.002). After 1 and 3 months of wearing an RGP lens, OSDI, TBUT, and ocular surface staining score were aggravated (all p < 0.001). The MGD grade, lid margin abnormality, meibomian gland expressibility, and meibum quality were aggravated after 1 and 3 months of wearing an RGP lens (all p < 0.001). MGD grade, lid margin abnormality, meibomian gland expressibility, and meibum quality were significantly more aggravated in the RGP lens group than in the OK lens group after 3 months (p < 0.001, p < 0.001, p= 0.001, p < 0.001). CONCLUSIONS: Use of OK and RGP lenses affects ocular surface status. Especially, meibomian gland parameters and OSDI showed greater changes in RGP lens wearers than OK lens wearers.
Meibomian Glands
;
Tears