Results 21 to 30 of about 8,469,152 (382)

Effect of laser peripheral iridotomy on contrast sensitivity using Spaeth/Richman Contrast Sensitivity test

Therapeutic Advances in Ophthalmology, 2022
Background: Laser peripheral iridotomy (LPI) is the current standard of care for primary angle-closure glaucoma. The existing literature lacks evidence regarding the effects of LPI on contrast sensitivity (CS) after the procedure.
Parul Ichhpujani, Sahil Thakur, Tanu Singh, Rohan Bir Singh, Suresh Kumar   +4 more
doaj   +1 more source

Normative database for Spaeth Richman contrast sensitivity test for Indian eyes

Indian Journal of Ophthalmology, 2022
Purpose: To ascertain normative database of contrast sensitivity (CS) using Spaeth/Richman CS test (SPARCS) in the Indian population. Methods: This cross-sectional study enrolled 200 healthy individuals, and CS was tested in both eyes of each participant
Sonia Bariya, Parul Ichhpujani, Obaidur Rehman, Suresh Kumar   +3 more
doaj   +1 more source

Stimulus-dependent contrast sensitivity asymmetries around the visual field

bioRxiv, 2020
Asymmetries in visual performance at isoeccentric locations are known as performance fields. At a fixed eccentricity, visual performance is best along the horizontal, intermediate along the lower vertical, and poorest along the upper vertical meridian ...
M. Himmelberg, J. Winawer, M. Carrasco
semanticscholar   +1 more source

Spatio-chromatic contrast sensitivity under mesopic and photopic light levels

Journal of Vision, 2020
Contrast sensitivity functions (CSFs) characterize the sensitivity of the human visual system at different spatial scales, but little is known as to how contrast sensitivity for achromatic and chromatic stimuli changes from a mesopic to a highly photopic
S. Wuerger, M. Ashraf, Minjung Kim, J. Martinovic, M. Pérez-Ortiz, Rafał K. Mantiuk   +5 more
semanticscholar   +1 more source

Short-Term Peripheral Contrast Reduction Affects Central Chromatic and Achromatic Contrast Sensitivity

Photonics, 2022
Peripheral retinal contrast reduction is suggested as a potential myopia control strategy. However, the underlying mechanism is yet unknown. Therefore, this study investigated the influence of peripheral contrast reduction on central chromatic and ...
Antonia Neumann, Alexander Leube, Najma Nabawi, Yannick Sauer, Peter Essig, Katharina Breher, Siegfried Wahl   +6 more
doaj   +1 more source

Effects of Different Contact Lens Designs on Visual Quality Among the Soft Spherical Contact Lens Users

Türk Oftalmoloji Dergisi, 2013
Purpose: To evaluate the effects of different lens designs on visual quality among soft spherical contact lens users. Material and Method: Forty eyes of twenty patients from our contact lens unit were included in this study.
Mustafa Demir, Sevda Aydın Kurna, Tomris Şengö   +2 more
doaj   +1 more source

Contrast sensitivity of insect motion detectors to natural images [PDF]

, 2008
How do animals regulate self-movement despite large variation in the luminance contrast of the environment? Insects are capable of regulating flight speed based on the velocity of image motion, but the mechanisms for this are unclear.
O'Carroll, David C., Rainsford, Tamath, Straw, Andrew D.   +2 more
core   +1 more source

Digital contrast sensitivity chart with varying visual acuity: Development and validation

Oman Journal of Ophthalmology, 2023
BACKGROUND: Contrast sensitivity (CS) evaluation is very much necessary for the diagnosis and management of eye conditions. Several disadvantages seen in the traditionally used Pelli-Robson (PR) chart persuaded us to develop a novel digital device for ...
Prateeksha G Hegde, Diwakar Rao, B Prudhvi, Namratha Hegde   +3 more
doaj   +1 more source

Influence of contrast media dose and osmolality on the diagnostic performance of contrast fractional flow reserve [PDF]

, 2017
Background—Contrast fractional flow reserve (cFFR) is a method for assessing functional significance of coronary stenoses, which is more accurate than resting indices and does not require adenosine.
Berry, Colin, Choi, Dong-Hyun, De Bruyne, Bernard, Fearon, William F., Gould, K. Lance, Jeremias, Allen, Johnson, Nils P., Kobayashi, Yuhei, Nishi, Takeshi, Oldroyd, Keith G., Pijls, Nico H.J.   +10 more
core   +1 more source

The contrast sensitivity of the cat

The Journal of Physiology, 1973
1. The experiments were carried out on pretrigeminal cats.2. By recording potentials evoked from the visual cortex by a grating stimulus, it was established that there was a linear relation between the voltage generated and the logarithm of the contrast of the grating.3.
CAMPBELL FW, MAFFEI L, PICCOLINO, Marco
openaire   +5 more sources