Search Results - "Zlatkova, M."

In vivo macular pigment measurements: a comparison of resonance Raman spectroscopy and heterochromatic flicker photometry by Hogg, R E, Anderson, R S, Stevenson, M R, Zlatkova, M B, Chakravarthy, U

“…Aim: To investigate whether two methods of measuring macular pigment—namely, heterochromatic flicker photometry (HFP) and resonance Raman spectroscopy…”
Get full text

Investigation of the effect of simulated lens yellowing, transparency loss and refractive error on in vivo resonance Raman spectroscopy by Hogg, R. E., Zlatkova, M. B., Chakravarthy, U., Anderson, R. S.

“…Purpose:  To separately investigate the impact of simulated age‐related lens yellowing, transparency loss and refractive error on measurements of macular…”
Get full text

Orientation identification at different background levels: its precision and distortions by Zlatkova, M

“…Orientation identification was studied at high (1000 td) and low (1 td) background illuminations. The subject had to estimate in degrees the orientation of a…”
Get more information

The contrast sensitivity function for detection and resolution of blue-on-yellow gratings in foveal and peripheral vision by Anderson, R. S., Zlatkova, M. B., Beirne, R. O.

“…Previous studies using polychromatic gratings have shown that the peripheral grating contrast sensitivity function is significantly different when the task is…”
Get full text

Elimination of the color discrimination impairment along the blue-yellow axis in patients with hypothyroidism after treatment with levothyroxine as assessed by the Farnsworth-Munsell 100 hue test by Racheva, Kalina, Totev, Tsvetalin, Natchev, Emil, Bocheva, Nadejda, Beirne, Raymond, Zlatkova, Margarita

“…Our previous study has shown that individuals with untreated hypothyroidism display significantly higher partial error scores ( ) along the blue-yellow axis…”
Get more information

Abstract PR199: Intravenous Patient Controlled Analgesia with Remifentanil Versus Continuous Epidural for Labor Analgesia by Karadjova, D., Shosholceva, M., Spasovski, S., Ivanov, E., Sivevski, A., Zlatkova, M., Churlinov, K.

Get full text

Binocular summation for grating detection and resolution in foveal and peripheral vision by Zlatkova, Margarita B, Anderson, Roger S, Ennis, Fergal A

“…Peripheral monocular grating resolution has been shown to be limited by the sampling density of the underlying retinal ganglion cells. We wanted to determine…”
Get full text

Estimating the critical duration for temporal summation of standard achromatic perimetric stimuli by Mulholland, Pádraig J, Redmond, Tony, Garway-Heath, David F, Zlatkova, Margarita B, Anderson, Roger S

“…To estimate the critical duration of temporal summation for achromatic Goldmann III stimuli under the conditions of standard automated perimetry (SAP) and…”
Get full text

The effect of cataract on spatial and temporal contrast sensitivity tests in glaucoma by KLEIN, JO, ZLATKOVA, M, PIERSCIONEK, B, LAURITZEN, JS

“…Purpose To investigate the efficacy of spatial and temporal contrast sensitivity (CS) tests for detecting early glaucoma in the presence of cataract Methods…”
Get full text

Length and width summation in human vision at different background levels by VASSILEV, A, ZLATKOVA, M, MITOVA, L

“…The effect of background intensity on the spatial summation of rectangular stimuli of varying length and width was studied in human psychophysical experiments…”
Get full text

Effect of light adaptation on the orientation acuity of human cone vision by Zlatkova, M, Vassilev, A

“…At the detection threshold, a line orientation is identified by the accuracy of 15-20 deg. Deviations from this rule are observed for short lines presented on…”
Get more information

Spatial summation of S-cone ON and OFF signals: Effects of retinal eccentricity by Vassilev, Angel, Mihaylova, Milena S., Racheva, Kalina, Zlatkova, Margarita, Anderson, Roger S.

“…We studied spatial summation for S-cone ON and OFF signals as a function of retinal eccentricity in human subjects. S-cone isolation was obtained by the…”
Get full text

Temporal summation and orientation acuity by Vasilev, A, Zlatkova, M

“…The effect of stimulus exposure time (ET) on the threshold intensity, necessary for fine orientation discrimination was compared with the effect of ET on the…”
Get more information

Reaction time and critical duration for lines' detection and identification of their orientation by Zlatkova, M, Vassilev, A, Mitov, D

“…Reaction time (RT) and duration of complete temporal summation (tc) were studied for both detection of lines and identification of their orientation. The RT…”
Get more information

Perception of orientation of short lines: its dependence on line's length and intensity by Zlatkova, M, Vassilev, A

“…The threshold intensity necessary for correct identification of orientation of a briefly presented line was measured as a function of line's lenght and number…”
Get more information

Invariants of spatial summation for S (short wavelength) cone vision by Vasilev, A, Anderson, R S, Zlatkova, M

“…Spatial summation in the human visual system was studied as a function of retinal eccentricity upon selective stimulation of the short-wavelength sensitive…”
Get more information

Reversed-phase high-performance liquid chromatography for evaluating the distribution of pharmaceutical substances in suppository base–phosphate buffer system by Dimitrova, Burya, Doytchinova, Irini, Zlatkova, Margarita

“…The aim of this study was to assess the potency of the reversed-phase high-performance liquid chromatography (RP-HPLC) for in vitro evaluation of the…”
Get full text

Changes in short-wavelength resolution acuity with age and defocus in the periphery: implications for relative ganglion cell loss by Anderson, R. S., Zlatkova, M. B., Coulter, E., Demirel, S.

“…Purpose:  Resolution acuity is known to be sampling limited for achromatic gratings in peripheral vision. In addition, peripheral achromatic resolution is…”
Get full text

The contrast sensitivity function for detection and resolution of blue-on-yellow gratings in foveal and peripheral vision: Visual performance of the human eye, Charman Festspiel, Manchester, UK by ANDERSON, R. S, ZLATKOVA, M. B, BEIRNE, R. O

Get full text

Spatial summation of blue-on-yellow light increments and decrements in human vision by Vassilev, Angel, Zlatkova, Margarita, Manahilov, Velichko, Krumov, Alexander, Schaumberger, Markus

“…In the primate retina, blue-OFF cells are less numerous than blue-ON cells but no psychophysical equivalent of this asymmetry has been found so far. The…”
Get full text