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@#AIM: To observe the location characteristics of the earliest tear film breakup in elderly patients with dry eyes.METHODS: Cross-sectional study. The 154 elderly patients with dry eyes in our hospital from July 2019 to December 2019 were included, with 143 right eyes, 124 left eyes, and 71 patients were males, 83 patients were females, aged 68-90(mean: 73.40±4.13)years old. The location of the earliest tear film breakup was investigated by using corneal topographer. The cornea was separated to four sectors to record the earliest tear film breakup location by anticlockwise order. The sector corresponding to the right eye was nasal superior, temporal superior, temporal inferior and nasal inferior respectively. And it corresponding to the left eye was temporal superior, nasal superior, nasal inferior and temporal inferior respectively. Then the sector which was the earliest tear film breakup location was recorded. At the same time, the distance which was from the earliest tear film breakup location to the centre of cornea was recorded too.RESULTS: The highest constituent ratio of area of right eye was nasal inferior(28.7%), then was temporal inferior(27.3%), nasal superior(20.3%), temporal superior(11.2%), and the constituent ratio of earliest tear film breakup occurred in 2-3 areas at the same time was 12.6%. The constituent ratio of the earliest tear film breakup area of left eye also was nasal inferior(31.5%), then was temporal inferior(25.0%), nasal superior(23.4%), temporal superior(11.3%), the constituent ratio of earliest tear film breakup occurred in 2-3 areas at the same time was 8.9%. There was no difference in the constituent ratio of tear film breakup area between two eyes(χ2=1.443, <i>P</i>=0.837). The distance from the earliest tear film breakup area of the nasal inferior quadrant to the centre of cornea was mostly the zone from 1.5-2mm and 2-2.5mm in both eyes.CONCLUSION: There is a certain regularity in the characteristics of tear film breakup area in elderly patients with dry eyes, and the earliest tear film breakup area of both eyes is mainly occurred in nasal inferior, and there is no significant difference between two eyes.
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@#AIM: To evaluate the difference and consistency of pupillary offset measured by the Pentacam anterior segment analyzer and Keratron Scout corneal topographer.<p>METHODS: Three hundred and eleven patients(604 eyes)who underwent excimer laser in situ keratomileusis from November 2017 to February 2018 were randomly selected. Before surgery, the pupillary offset values were measured by Pentacam and Keratron, and the differences and consistency of the values between the two instruments were compared.<p>RESULTS: The pupillary offset values of the right eyes, left eyes, and both eyes between Pentacam and Keratron were statistically different(<i>P</i><0.05). There were no significant statistical differences in the offset orientations of right eyes, left eyes and both eyes between the two instruments(<i>P</i>>0.05). The 95% consistent line(<i>LoA</i>)of offset value and offset orientation in the right eyes, left eyes and both eyes between the two instruments were -0.11-0.19mm and -157.01°-135.35°, -0.12-0.18mm and -150.16°-158.22°, -0.11-0.19mm and -154.30°-147.10°, respectively. <p>CONCLUSION: The pupillary offset measured by the Pentacam was smaller than that measured by the Keratron, but the difference was within the clinically acceptable range. The accurate pupillary offset can be obtained, and be the mutual reference, correction and supplement in the both instruments.
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@#AIM: To investigate the repeatability and agreement of Pentacam Front Section Analyzer and Keratron Scout Corneal Topographer in measuring Kappa angle.<p>METHODS: Totally 69 patients were randomly selected from Ophthalmology Department of Leshan People's Hospital. Three readings were taken by the same examiner. Results were recorded in(<i>X</i>, <i>Y</i>)coordinates format and assessed by intraclass correlation coefficient(ICC), Cronbach's Alpha Coefficient, <i>t-</i>test, Pearson correlation analysis and bland-altman analysis.<p>RESULTS: Both instruments showed excellent repeatability in Kappa angle assessment. The results significantly correlated(<i>X</i> value: <i>r</i>=0.90,<i> P</i><0.01; <i>Y</i> value: <i>r</i>=0.91, <i>P</i><0.01), however, no significant difference were found between the two instruments. The widest 95% LoA was -0.11-0.14mm for <i>X</i> coordinate and -0.10-0.11mm for <i>Y</i>.<p>CONCLUSION: Pentacam and Keratron Scout showed excellent repeatability and agreement in Kappa angle assessment. The two instruments could aid and verify each other.
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PURPOSE: To determine the power vector and aberrations before and after surgery for pterygium using a corneal topographer and a wavefront aberrometer. METHODS: The study group consisted of 34 eyes of 31 patients with pterygium, and were divided into two groups by pterygium size ( or = 3 mm, group II). Power vector and wavefront aberrations were evaluated using a corneal topographer (Oculus inc., Germany) and a wavefront aberrometer (LADARWAVE(R), Hartmann shack aberrometer, Alcon inc., US) at pre- and postoperative 1 week, 1 month, and 3 months. RESULTS: The preoperative blurring strength (B) and high order aberrations significantly decreased at postoperative 3 months in all groups (P or = 3 mm). To reduce aberrations and astigmatism effectively, we suggested surgical intervention in eyes with pterygia sized < 3.0 mm.