Vision is one of the most important special senses and is the primary source of external information. The role of vision in our everyday lifestyles is immense and adequate visual skills are needed for simple tasks which include reading and writing, that are especially important for students. Stress is an important factor which most students deal with, and along with other external factors, coul...

AIM To determine the repeatability and agreement of stereoacuity measurements made using some of the most widely used clinical tests: Frisby, TNO, Randot and Titmus. METHODS Stereoacuity was measured in two different sessions separated by a time interval of at least 24h but no longer than 1wk in 74 subjects of mean age 20.6y using the four methods. The study participants were divided into two...

OBJECTIVE To describe the possible impairment of binocular vision in primary open angle glaucoma (POAG) patients. METHOD A cross-sectional study was conducted on 58 glaucoma patients, 76 ocular hypertensives and 82 normal subjects. They were examined with a battery of binocular tests consisting of the measurement of phoria angles, amplitudes of fusion (AF), near point of convergence (NPC) ass...

Over a century ago workers such as J. Lubbock and K. von Frisch developed behavioural criteria for establishing that non-human animals see colour. Many animals in most phyla have since then been shown to have colour vision. Colour is used for specific behaviours, such as phototaxis and object recognition, while other behaviours such as motion detection are colour blind. Having established the e...

This paper presents performance test results of true-color night vision cameras. Such cameras are sensitive to the visible to near-infrared (VNIR) portion of the spectrum allowing for the “true-color” of scenes and objects to be displayed and recorded under low-light-level conditions. True-color refers to an approximate reproduction of the subjective colors that would be seen by the human eye i...

Panel tests of color vision (eg FM100-Hue test) lack a common quantitative method for the scoring of cap arrangements. We describe a scoring method applicable to all panel tests that makes use of a novel technique to analyze test cap data, namely the calculation of a moment of inertia from the Color Difference Vectors (CDVs) of any arrangement pattern. Using the Farnsworth D-15 panel, as an exa...

Over the last decade, a series of experiments sponsored by the U.S. Department of Energy showed that rods play a role in vision in lighting conditions typical of the workplace. The tests took place in realistic environments with typical interior lighting and task conditions. The tests showed that both vision and lighting energy efficiency would be improved if lighting practice accounted for the...

Congenital colour vision anomalies are common, with red/green anomaly affecting 8-10% of males. Acquired loss of colour perception can be a sensitive indicator of macular and optic nerve disease. It is vital to understand how colour vision tests can be used effectively to diagnose the type of colour anomaly. This article reviews the different tests available and the protocols for their appropri...

abstract background and aim: regard with the importance of balance in daily activities especially in sport activities and understanding the important factor affecting it, the purpose of this study was to compare the role of vision system on dynamic postural stability of young women with men elite athletes. materials and methods: twenty six young women and men elite swimmer were chosen from the ...

PURPOSE Mild cataracts can interfere with visually dependent everyday activities, although they only minimally affect static visual acuity. This study compared the effects of simulated cataracts with that of optical blur on driving performance and determined the extent to which acuity could account for variations in driving performance either alone or in combination with supplementary vision te...