No abstract available.
Tears*

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*

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

No abstract available.
Tears

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

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*

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*

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 ; Aged

VDT syndrome has been understood as the outocme of the computerized socio-economic cultures in this modern age. It affects many workers on larious visual functions as well as affecting some general health conditions including neurologic, circulatory, and musculosckeletal system. We conducted series of investigations to evaluate the influence of VDT work on the physiologic functions using objective ocular examinations on VDT workers with non-VDT workers as controls. Prolongation of near point decreased accommodation amplitude, myopic shift of refractive condition, and decreased amout of tear formation were significantly indicative in the VDT workers' group. The above functional disturbances can significahtly, deteriorate not only working effeciency but general physical condition if appropriate measures are not provided quickly. Therefore, it is firmly suggested that a comprehensive epidemiological study should be implemented aimed at ImprovIng working situations for VDT workers.
Asthenopia ; Epidemiologic Studies ; Tears

PURPOSE: To evaluate the effect of topical pilocarpine on basic tear secretion, using the Schirmer test. METHODS: The Schirmer test was performed in 22 eyes of 11 healthy volunteers before instillation and at 10, 20, and 30 minutes after instillation of 1% pilocarpine and in 22 eyes of 12 healthy volunteers before instillation and at 10, 20, and 30 minutes after instillation of 2% pilocarpine. As for control group, the Schirmer test was performed in 22 eyes of 11 healthy volunteers by the same method except with normal saline. RESULTS: The ratio of tear secretion was calculated by dividing the wet length of a Schirmer strip after instillation by the wet length before instillation for comparative analysis. In the control group, the mean ratio decreased with time to 0.78 at 10 minutes, 0.64 at 20 minutes, and 0.63 at 30 minutes after instillation of normal saline. In the 1% pilocarpine group, the mean ratio decreased with time, but there was no significant difference in comparison to the ratio of the control group. In the 2% pilocarpine group, the ratio increased significantly to 1.28 (p<0.001) at 10 minutes, 1.07 (p=0.002) at 20 minutes, and decreased to 0.63 (p=0.041) at 30 minutes after instillation. CONCLUSIONS: The basic tear secretion did not change significantly after instillation of 1% pilocarpine but increased significantly at 10 minutes after instillation of 2% pilocarpine to the highest level observed, which was followed by a decrease in basic tear secretion.
Healthy Volunteers ; Pilocarpine* ; Tears*