Colour Vision in a Case of Unilateral Nuclear Cataract

1984 ◽  
pp. 343-348 ◽  
Author(s):  
Elmar Wolf ◽  
Guido Kluxen
Keyword(s):  
Colour Vision ◽  
Nuclear Cataract

THE COLOUR VISION DEFICIENCIES AMONG STUDENTS OF HUE SECONDARY SCHOOL OF TRANSPORTATION

2013 ◽  
pp. 76-81
Author(s):  
Thi Anh Thu Nguyen ◽  
Thi Mai Dung Nguyen
Keyword(s):  
Secondary School ◽  
Colour Vision ◽  
Daily Life ◽  
Visual Disabilities ◽  
Occupation Group ◽  
Different Types ◽  
Colour Blindness ◽  
Critical Requirement

Background: Colorblind disability causes difficulties for people in daily life. Derived from the critical requirement to detect the patients in order to help prevent inappropriate careers, especially careers related to transportation, this research aim to determine the situations and the distributions of different types of visual disabilities. Materials: 1174 students (787 boys and 387 girls) including 2 groups: occupation group and transportation group were tested with ISHIHARA chromatic plates for colour vision deficiencies (CVD) (CVD iclude the total colour blindness, red- green blindness, red-blindness, green- blindness). The results are showed as follow: (i) Frequency of CVD boys among boy group is 4.70%; (ii) Frequency of CVD girls among girls group is 2.58%; (iii) In boy group, among 3 types of red- green blindness, the green-blindness has the higher frequency (3.18%) comparision with these ones of the red- green blindness and red-blindness. The total colour defiency was hardly; (iv) Frequency of CVD students among occupation group is 4.15%; (v) Frequency of CVD students among transportation group is 3.83%.

Pathogenesis of Age-related Cataract: a systematic review of proteomic studies

2020 ◽  
Vol 17 ◽  
Author(s):  
Christina Karakosta ◽  
Argyrios Tzamalis ◽  
Michalis Aivaliotis ◽  
Ioannis Tsinopoulos
Keyword(s):  
Systematic Review ◽  
Oxidant Stress ◽  
Critical Role ◽  
Human Lens ◽  
Nuclear Cataract ◽  
Cataract Formation ◽  
Post Translational Modification ◽  
Ability To Act ◽  
Age Related

Background/Objective:: The aim of this systematic review is to identify all the available data on human lens proteomics with a critical role to age-related cataract formation in order to elucidate the physiopathology of the aging lens. Materials and Methods:: We searched on Medline and Cochrane databases. The search generated 328 manuscripts. We included nine original proteomic studies that investigated human cataractous lenses. Results:: Deamidation was the major age-related post-translational modification. There was a significant increase in the amount of αA-crystallin D-isoAsp58 present at all ages, while an increase in the extent of Trp oxidation was apparent in cataract lenses when compared to aged normal lenses. During aging, enzymes with oxidized cysteine at critical sites included GAPDH, glutathione synthase, aldehyde dehydrogenase, sorbitol dehydrogenase, and PARK7. Conclusion:: D-isoAsp in αA crystallin could be associated with the development of age-related cataract in human, by contributing to the denaturation of a crystallin, and decreasing its ability to act as a chaperone. Oxidation of Trp may be associated with nuclear cataract formation in human, while the role of oxidant stress in age-related cataract formation is dominant.

Birds in the Dark: Complementary and Partial Information

2017 ◽  
Author(s):  
Graham R. Martin
Keyword(s):  
Annual Cycle ◽  
Colour Vision ◽  
Partial Information ◽  
Night Time ◽  
Light Levels ◽  
Night Feeding ◽  
Nocturnal Species ◽  
Length Changes

Night-time poses exacting problems for vision, resolution inevitably falls and colour vision is not possible as light levels decrease to those of natural night time. Furthermore, light levels are highly variable depending upon whether there is moonlight, and night length changes dramatically in the annual cycle according to latitude. Few birds exploit the resources available at night. Those that do rely upon information received from vision complemented by information from other senses (hearing, olfaction, and touch), and upon highly specialized and restricted behaviours. However, many birds occasionally exploit night-time, e.g. during migration, arriving and departing from nests, and occasional night feeding. Some seabirds dive to such depths that they experience night-time light levels when foraging. Truly nocturnal species such as owls, kiwi, and oilbirds are highly sedentary, and this is essential to allow them to interpret correctly the partial information that is available to them.

scholarly journals Myopia-26, the female-limited form of early-onset high myopia, occurring in a European family

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Noémi Széll ◽  
Tamás Fehér ◽  
Zoltán Maróti ◽  
Tibor Kalmár ◽  
Dóra Latinovics ◽  
...  
Keyword(s):  
Middle Ages ◽  
Early Onset ◽  
Colour Vision ◽  
High Myopia ◽  
Field Testing ◽  
Cone Dystrophy ◽  
Ophthalmological Examination ◽  
Whole Exome ◽  
Caucasian Family ◽  
Cone System

Abstract Background Female-limited early-onset high myopia, also called Myopia-26 is a rare monogenic disorder characterized by severe short sightedness starting in early childhood and progressing to blindness potentially by the middle ages. Despite the X-linked locus of the mutated ARR3 gene, the disease paradoxically affects females only, with males being asymptomatic carriers. Previously, this disease has only been observed in Asian families and has not gone through detailed investigation concerning collateral symptoms or pathogenesis. Results We found a large Hungarian family displaying female-limited early-onset high myopia. Whole exome sequencing of two individuals identified a novel nonsense mutation (c.214C>T, p.Arg72*) in the ARR3 gene. We carried out basic ophthalmological testing for 18 family members, as well as detailed ophthalmological examination (intraocular pressure, axial length, fundus appearance, optical coherence tomography, visual field- testing) as well as colour vision- and electrophysiology tests (standard and multifocal electroretinography, pattern electroretinography and visual evoked potentials) for eight individuals. Ophthalmological examinations did not reveal any signs of cone dystrophy as opposed to animal models. Electrophysiology and colour vision tests similarly did not evidence a general cone system alteration, rather a central macular dysfunction affecting both the inner and outer (postreceptoral and receptoral) retinal structures in all patients with ARR3 mutation. Conclusions This is the first description of a Caucasian family displaying Myopia-26. We present two hypotheses that could potentially explain the pathomechanism of this disease.

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