Acta Medica Alanya (Aug 2019)
The Effects of The Artificial Tears Preparations on Contrast Sensitivity in Healthy Individuals
Abstract
Aim: Determination of the change in contrast sensitivity (CS) values according to time after the use of artificial tears preparations with a different retention time (RT) and different viscosity in healthy individuals. Methods: From 120 healthy individuals, after a detailed ophthalmologic examination, fifteen were included in the study. Low viscosity Hydroxypropyl methylcellulose (HPMC)+Dextran 70 (Drug A), low viscosity Polyvinyl prolidone (Drug B) and high viscosity Polyacrylic acid gel (Drug C) artificial tears preparations were used. First Drug A was used, followed one week later by Drug B, and lastly by Drug C. One eye of the individuals were selected randomly and one drop was added after 1-5, 15, 30, 60, 90 minutes; CS values were measured with Functional Acuity Contrast Test (FACT). Results: With Drug A, at 6 cycles per degree (cpd) spatial frequency, the values of CS at 30th,60th,90th min. significantly increased compared to the values at base (0 min) and 1st-5th min. (p<0,05). With Drug B, at 12 cpd frequency, the values at 30th min. significantly increased, compared to the values at 1st-5th min. (p<0.05). With medication C, at 3 cpd frequency, the values at 1st-5th min. significantly decreased, compared to the values at base (0th min.), 15th, 30th ,60th ,90th min. (p<0,05). With C, at 6 cpd frequency, the values at 1st-5th min. significantly decreased compared to the values at base (0th minute), 30th, 60th ,90th min. (p<0,01). Also at 15th min., we noted a significant decrease in the values compared to values at 30th, 90th min. (p<0,05). Again with C at 12 cpd frequency, the values at 1st-5th min. significantly decreased compared to values at base (0th min), 60th, 90th min. (p<0,05). Conclusion: In the case of healthy individuals with tears film stability problems with the use of low viscosity artificial tears preparation in the form of drops, It could not be shown to decrease retinal image quality by applying CS test within retention times, even increased in some spatial frequencies.
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