ABSTRACT
AIMS: The main aim of our study was to demonstrate the difference in endothelial cell density between a group of keratoconus contact lens users and non-contact lens users (without keratoconus). MATERIAL AND METHODS: In our study we had data from 96 subjects with an average age of 40.5 ±14.05 years. For the purposes of our study, we worked with each eye separately for each subject (n = 192). Keratoconus (research group) was diagnosed in 97 eyes. The mean age of the patients in the research group was 41.9 ±10.6 years. Keratoconus was not diagnosed in the remaining 95 eyes (control group). The mean age of the patients in the control group was 39.5 ±16.6 years. In the keratoconus group, the patients wore hard contact lenses (HCL) in a total of 43 eyes, hybrid contact lenses (HbCL) in 48 eyes and soft contact lenses (SCL) in 6 eyes. The average total period of contact lens use in the research group was 10.6 ±2.36 years. RESULTS: The average number of endothelial cells in the research group was 2607.11 ±298.45 cells per mm2. The average number of endothelial cells in the control group was 2831.94 ±523.51 cells per mm2. We tested these two variables using a T-test, which showed a statistically significant difference (p < 0.001). A statistically significant difference in the mean endothelial cell count related to patient age and use / non-use of contact lenses of two types was demonstrated only in the under-40 group in a comparison of the non-contact and keratoconus group with the keratoconus group using HCL (p = 0.02). A statistically significant difference in the length of contact lens wear was demonstrated between the keratoconus-free group with or without SCL and the keratoconus group when wearing HCL or HbCL for more than 20 years (p = 0.01 and p = 0.02). For HbCL users, this difference was demonstrated also after 15 years of wearing (p = 0.001). CONCLUSION: From our results we can conclude that there is a difference in endothelial cell density between patients with and without keratoconus.
Subject(s)
Contact Lenses, Hydrophilic , Keratoconus , Humans , Adult , Middle Aged , Young Adult , Endothelial Cells , Keratoconus/diagnosis , Keratoconus/therapy , Endothelium, Corneal , Cell CountABSTRACT
UNLABELLED: Aim of the paper is to introduce and evaluate the microperimetry as a support technique in the evaluation of the ARMD wet form bevacizumab (Avastin) treatment efficacy. METHODS: Twenty-one patients (21 eyes) with ARMD wet form were included in the study; they were examined by means by OCT/SLO (optic coherence tomography / scanning laser ophthalmoscope) machine whose part is the microperimetric test. In each patient, there were two microperimetric examinations performed - the first one was done one day before the application of the treatment and the second one one month after the application. The values of retinal sensitivity and possible absolute scotomas were recorded by the microperimeter. The best-corrected visual acuity measurement was recorded as well. RESULTS: The measurements were performed in the group of 21 eyes of 8 men and 13 women (age 50 - 86 years). There were the differences between the genders evaluated (at the selected level of significance of 0.05) in the following categories: age, retinal sensitivity, absolute scotoma extent, and visual acuity. Differences among men and women were found in retinal sensitivity, before the treatment and after it as well. The influence of the gender we may exclude, except the category of retinal sensitivity. In the categories age, visual acuity, and even absolute scotoma extent, no differences between genders were found. The retinal sensitivity (in case of fixation up to 4 degrees) improved in the men group from 14.49 dB ± 2.44 dB to 15.65 dB ± 2.61 dB, in the women group from 10.47 dB ± 3.11 dB to 12.05 dB ± 3.10 dB. The visual acuity in the whole group (men + women) increased from 0.48 ± 0.17 to 0.60 ± 0.18, so improved by 12 %. Statistically significant is also the result of the treatment in the absolute scotoma. CONCLUSION: Microperimetry is a suitable method to evaluate the function of macular region of the retina. The study confirms, that the treatment of wet form ARMD by means of intravitreal bevacizumab injections significantly increases the retinal sensitivity (in dB), decreases of the extent of absolute scotoma and improves the visual acuity by 12 %.
Subject(s)
Visual Field Tests/methods , Visual Fields , Wet Macular Degeneration/diagnosis , Aged , Aged, 80 and over , Female , Humans , Male , Middle Aged , Visual Acuity , Wet Macular Degeneration/physiopathologyABSTRACT
UNLABELLED: This study follows the occurrence of refractive errors in population and the possible selection of the appropriate type of corrective aids. Objective measurement and subsequent determination of the subjective refraction of the eye is on essential act in opotmetric practice. The file represented by 615 patients (1230 eyes) is divided according to the refractive error of myopia, hyperopia and as a control group are listed emetropic clients. The results of objective and subjective values of refraction are compared and statistically processed. METHODS: The study included 615 respondents. To determine the objective refraction the autorefraktokeratometer with Placido disc was used and the values of spherical and astigmatic correction components, including the axis were recorded. These measurements were subsequently verified and tested subjectively using the trial lenses and the projection optotype to the normal investigative distance of 5 meters. After this the appropriate corrective aids were then recommended. RESULTS: Group I consists of 123 men and 195 women with myopia (n = 635) of clients with an average age 39 +/- 18,9 years. Objective refraction - sphere: -2,57 +/- 2,46 D, cylinder: -1,1 +/- 1,01 D, axis of: 100 degrees +/- 53,16 degrees. Subjective results are as follows--the value of sphere: -2,28 +/- 2,33 D, cylinder -0,63 +/- 0,80 D, axis of: 99,8 degrees +/- 56,64 degrees. Group II is represented hyperopic clients and consists of 67 men and 107 women (n = 348). The average age is 58,84 +/- 16,73 years. Objective refraction has values - sphere: +2,81 +/- 2,21 D, cylinder: -1,0 +/- 0,94 D; axis 95 degree +/- 45,4 degrees. Subsequent determination of subjective refraction has the following results - sphere: +2,28 +/- 2,06 D; cylinder: -0,49 +/- 0,85 D, axis of: 95,9 degrees +/- 46,4 degrees. Group III consists from emetropes whose final minimum viasual acuity was Vmin = 1,0 (5/5) or better. Overall, this control group is represented 52 males and 71 females (n = 247). The average age was 43 +/- 18,73 years. Objective refraction - sphere: +0,32 +/- 0,45 D; cylinder: -0,51 +/- 0,28 D, axis of: 94,7 degrees +/- 57,5 degrees. DISCUSSION: Values of objective refraction take higher values than the subsequent execution of the subjective examination of the refractive error and recommendation of the appropriate type of corrective aids. This all is in examined groups and in the individual components of refractive errors. It also confirmed the hypothesis that the population outweighs with-the-rule astigmatism, the deployment of resources according to the literature ranges from 90 degrees +/- 10 degrees. CONCLUSION: The values observed correction of refractive errors are then derived also offer the most common prescription ranges and products for the correction of given ametropia. In the selection and design corrective aids, we are often limited. Our task is then to manufacture high quality, functional and aesthetic corrective aids, you need to connect knowledge from the fields of optics, optometry and ophthalmology. Faster visual rehabilitation simplifies clients' rapid return to everyday life.
