Avtor/Urednik		Pajek, Jernej
Naslov		Ocena hitrih testnih strategij pri računalniško podprti statični perimetriji
Tip		monografija
Kraj izdaje		Ljubljana
Založnik		Medicinska fakulteta
Leto izdaje		1999
Obseg		str. 35
Jezik		slo
Abstrakt		BACKGROUND. Automated perimetry is a diagnostic method which measures the threshold of differential light sensitivity (DLS) on multiple test points in visual field and is based on presenting stimuli of varied brightness and recording the responses of the patient The determination of statistical visual field indices is based on measured values. The two most important indices are mean defect (MD) of nneasured values and loss variance (LV). LV increases with the heterogeneity of DLS in the visual field and is therefore a good indicator of well defined visual field depressions (scotomas). Software controlling the perimeter measures the DLS threshold by employing differeni test strategies. The normal strategy is routinely used and represents a standard. It changes the brightness of presented stimuli in decreasing steps of 4, 2 and 1 dB, until the threshold is determined with a 1 dB accuracy. Using the normal strategy the examination takes 15 minutes on average and is therefore demanding and fatiguing for the patient. The duration was shortened by development of fast perimetric strategies (dynamic strategy and TOP strategy). The dynamic strategy cuts the examination time in half. It is based on the expansion of threshold zone appearing in the area of lowered DLS and for this reason it changes the brightness of the stimulus in this areas in bigger steps (up to 10 dB). TOP strategy shortens the examination by 80%. Measured value of a certain point is used by the TOP strategy also for the determination of threshold of the neighboring points regarding the in-between distances. AIMS AND HYPOTHESES. By analyzing the results of nomnal, dynamic and TOP strategy measured on the same examinees, we wanted to study the differences between the strategies in determination of MD, LV, the differences in determination of number of all points with a deficit and number of points with a significant deficit of p<0,005. (Abstract truncated at 2000 characters).
Deskriptorji		SCOTOMA PERIMETRY DIAGNOSIS, COMPUTER-ASSISTED SENSITIVITY AND SPECIFICITY