We showed that the RT Icare Pro ensures IOP measurements that are more comparable with the measurements obtained with the GAT than the measurements that are provided by UHS ST.
BackgroundThe available scientific literature contains descriptions of manual, semi-automated and automated methods for analysing angiographic images. The presented algorithms segment vessels calculating their tortuosity or number in a given area. We describe a statistical analysis of the inclination of the vessels in the fundus as related to their distance from the center of the optic disc.MethodsThe paper presents an automated method for analysing vessels which are found in angiographic images of the eye using a Matlab implemented algorithm. It performs filtration and convolution operations with suggested masks. The result is an image containing information on the location of vessels and their inclination angle in relation to the center of the optic disc. This is a new approach to the analysis of vessels whose usefulness has been confirmed in the diagnosis of hypertension.ResultsThe proposed algorithm analyzed and processed the images of the eye fundus using a classifier in the form of decision trees. It enabled the proper classification of healthy patients and those with hypertension. The result is a very good separation of healthy subjects from the hypertensive ones: sensitivity - 83%, specificity - 100%, accuracy - 96%. This confirms a practical usefulness of the proposed method.ConclusionsThis paper presents an algorithm for the automatic analysis of morphological parameters of the fundus vessels. Such an analysis is performed during fluorescein angiography of the eye. The presented algorithm automatically calculates the global statistical features connected with both tortuosity of vessels and their total area or their number.
Purpose To compare anterior segment measurements of two optical systems of patients with clear lens and cataract Methods 34 cataractous eyes and 32 eyes with clear lens were examined using the Zeiss IOL‐Master and Topcon Aladdin system. In all eyes we measured Axial Length (AL), Keratometry (K1, K2) and Anterior chamber depth (ACD). The results were compared and analysed using Bland‐Altman plots Results Comparison of the eye lengths, as well as of the keratometric and ACD measurements showed good correlation and agreement between the measurements obtained by both methods. Standard Deviation (SD) for Axial Length difference is about 0,034 for clear lens eyes and 0,028 for cataractous eyes. SD for K1 and K2 difference is for clear lens eyes 0,23/0,29 and 0,17/0,18 for cataractous eyes. ACD differences are respectively 0,11 and 0,15 Conclusion The comparisons between IOL Master and the ALADDIN show a very good alignment for Axial Length for both groups of patients. There was also acceptable alignment for K1, K2 and ACD measurement. Both the analyzed instruments show a good correlation and precision
Purpose To evaluate immediate impact of hyaluronic and methylcellulose artificial tears on tear film stability. Methods We performed keratography with tear film analyze in 21 volunteers using Keratograph 4 (Oculus, Germany). After base measurement, volunteers received topical artificial tears drops containing 0.15% Sodium Hyaluronate into right eye and 0.5% Carboxyl Methylcellulose into left eye. After 15 and 30 minutes keratography measurements were repeated. Results In keratography analyzes we observed 4 types of tear film instability, short‐time break‐up on small area or big area, long‐time break‐up on small or big area. Mean size of tear meniscus in right eyes before drops was 0.3±0.1 mm and 0.32±0.09/0.33±0.09 mm 15/30 minutes after hyaluronic drops respectively (p<0.05, Kruskal‐Wallis test). In left eyes tear meniscus size was 0.32±0.1/0.33±0.1/0.34±0.1 mm respectively before and after methylcellulose drops (p<0.05, Kruskal‐Wallis test). First and mean non‐invasive break‐up‐time in right eyes was 10.7/16.8 sec before drops and 12/18; 12/17 – 15 and 30 minutes after hyaluronic drops application (p>0.05, Kruskal‐Wallis test). In left eyes these parameters were 12/16; 13/18 and 13/17 sec respectively before and after methylcellulose drops (p>0.05, Kruskal‐Wallis test). Conclusion Immediate impact of hyaluronic and methylcellulose artificial tears on tear film seems to be related more to increase of tear meniscus size, not to tear film break‐up time or break‐up surface. Keratograhy measurements allow for detail analyzes of tear film state, which includes not only break‐up time but also break‐up surface, which could be novel indicator for tear film stability impossible to measure in classic slit lamp.
Purpose The aim of this study was to show the usefullness of three different methods of Intraocular Pressure (IOP) measurements: Goldmann Applanation Tonometer, Rebound Tonometer and Ultra High‐Speed Scheimpflug Technology. Methods The examined group consisted of 96 patients, 192 eyes (63 females, 33 males of mean age 59,3±19,9 years old). IOP measurements were carried out using Goldmann Applanation Tonometer (GAT), Rebound Tonometer Icare Pro (RT) and Ultra High‐Speed Scheimpflug Technology (UHS ST) –“Corvis ST” with pachymetry which automatically took into account of central corneal thickness (CCT) correction. Additionally corneal pachymetry with Pentacam, Oculus were made to considered CCT in GAT IOP value. Statistical analysis was based on the software Statistica 10.0 PL, Statsoft, Poland. Results Mean IOP measured with GAT was 15,6±3,75 mmHg; GAT with CCT correction 15,7±3,7 mmHg; mean IOP measured with RT was 15,6±3,5 mmHg; with UHS ST 16,1±4,0 mmHg. Mean CCT measured with UHS ST was 543,7±52,7 µm; with Pentacam 547,9±54,0 µm. In comparison, there is significant difference between IOP measured with GAT and GAT+CCT, RT versus UHS ST (P<0,001) and no significant between GAT, GAT+CCT versus RT (p>0,5). Central Corneal Thickness was without differences in measurements carried out with UHS ST and Pentacam. All technics showed correlation IOP with CCT (p<0,05; r~0,3). Conclusion Applanation Tonometer and Rebound Tonometer can be equal methods of IOP measurements in contrast to Ultra High‐Speed Scheimpflug Technology which give significant different values but can be use to take accurate measurements of Central Corneal Thickness
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