Results: It is observed that values of tear break up time, Schimer I and Schimer II were decreasing at one week and one month post LASIK as compare to one week pre LASIK values. Mean tear break up time at one week of pre LASIK was 14.72 ± 1.08 seconds (P=0.000), at one week post LASIK was 13.64 ± 1.507 seconds (P=0.000) and at one month post LASIK was 13.02 ± 1.695 seconds (P=0.000). Conclusion: Laser in situ keratomileusis (LASIK) significantly changes tear film stability and tear secretions for at least one month post operatively.
This paper presents the axial and radial magnetic fields strength equations at any point inside or outside a finite solenoid with infinitely thin walls. Solution of the equation has been obtained in terms of tabulated complete elliptic integrals. For the axial field, an accurate approximation is given in terms of elementary function. Internal and external magnetic fields to the solenoid are presented in graphical form with normalized values for a wide variety of solenoid dimensions. A comparison with previous studies has been done, a good correlation between the two results is achieved and the ratio of error is calculated
Objectives: To determine the effect of LASIK on tear film stability. Study Design:Cross sectional, prospective study. Setting: The study was conducted in D. G. Laser Vision andDiagnostic Center, D.G. Khan, South Punjab, Pakistan. Period: From March 2016 to September2016. Materials and Methods: One hundred patients (two hundred eyes) were selected forthis study. SPSS version 20 was used to analyze the data. Categorical variables presented asfrequency and percentages and numerical variables presented as mean ± standard deviation.Results: It is observed that values of tear break up time, Schimer I and Schimer II were decreasingat one week and one month post LASIK as compare to one week pre LASIK values. Mean tearbreak up time at one week of pre LASIK was 14.72 ± 1.08 seconds (P=0.000), at one week postLASIK was 13.64 ± 1.507 seconds (P=0.000) and at one month post LASIK was 13.02 ± 1.695seconds (P=0.000). Conclusion: Laser in situ keratomileusis (LASIK) significantly changestear film stability and tear secretions for at least one month post operatively.
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