Alcohol consumption.[4] In addition, the vision becomes blurred or double since eye muscles lose their precision causing them to be unable to focus on the same object.
Sustained (1 second or more) high accelerations.[5] Typically, flying an airplane with a centripetal acceleration of up to or over 39 m/s2 (about 4g) with the head towards the center of curvature, common in aerobatic or fighter pilots. In these cases, tunnel vision and greyout may proceed to a g-force induced Loss Of Consciousness (g-LOC).
Exposure to oxygen at a partial pressure above 1.5-2 atmospheres, producing central nervous system oxygen toxicity, called narcosis.[8] Other symptoms can include dizziness, nausea, blindness, fatigue, anxiety, confusion and lack of coordination.
Eyeglass users experience tunnel vision to varying degrees due to the corrective lens only providing a small area of proper focus, with the rest of the field of view beyond the lenses being unfocused and blurry. Where a naturally sighted person only needs to move their eyes to see an object far to the side or far down, the eyeglass wearer may need to move their whole head to point the eyeglasses towards the target object.[citation needed]
The eyeglass frame also blocks the view of the world with a thin opaque boundary separating the lens area from the rest of the field of view. The eyeglass frame is capable of obscuring small objects and details in the peripheral field.[citation needed]
Mask, goggle, and helmet users
Wide-field, wrap-around diving mask
Diving mask with narrow field of view
Extremely large wide-field binoculars that would not be practical to carry
Activities which require a protective mask, safety goggles, or fully enclosing protective helmet can also result in an experience approximating tunnel vision. Underwater diving masks using a single flat transparent lens usually have the lens surface several centimeters from the eyes. The lens is typically enclosed with an opaque black rubber sealing shell to keep out water. For this type of mask the peripheral field of the diver is extremely limited. Generally, the peripheral field of a diving mask is improved if the lenses are as close to the eye as possible, or if the lenses are large, multi-window, or is a curved wrap-around design.[citation needed]
Protective helmets such as a welding helmet restrict vision to an extremely small slot or hole, with no peripheral perception at all. This is done out of necessity so that ultraviolet radiation emitted from the welding arc does not damage the welder's eyes due to reflections off shiny objects in the peripheral field.[citation needed]
Optical instruments
Binoculars, telescopes, and microscopes induce an experience of extreme tunnel vision due to the design of the optical components.
A wide field microscope or telescope generally requires much larger diameter and thicker lenses, or complex parabolic mirror assemblies, either of which results in significantly greater cost for construction of the optical device.[citation needed]
Wide-field binoculars are possible, but require bulkier, heavier, and more complex eyepieces. The diameter of the objective lenses is unimportant for field of view.[10] The widest-angle eyepieces used in telescopes are so large that two would not fit side-by-side for use in binoculars.[citation needed]
See also
Target fixation, a psychological phenomenon where a person at the controls of a vehicle risks inadvertently colliding with a specific object as a result of intensely focusing on it.
^. 23 November 2005. Archived from the original on 2005-11-23.
^Mills, Kenneth C.; Spruill, Susan E.; Kanne, Roy W.; Parkman, Katherine M.; Zhang, Ying (5 September 2016). "The Influence of Stimulants, Sedatives, and Fatigue on Tunnel Vision: Risk Factors for Driving and Piloting". Human Factors: The Journal of the Human Factors and Ergonomics Society. 43 (2): 310–327. doi:10.1518/001872001775900878. PMID 11592671. S2CID 6852335.
^ ab. 5 October 2006. Archived from the original on 2006-10-05.
^. 22 November 2005. Archived from the original on 2005-11-22.
^"Meade Sports Optics - How to Select the Right Binocular". www.meade.com.
External links
January 31, 2023
tunnel, vision, other, uses, disambiguation, loss, peripheral, vision, with, retention, central, vision, resulting, constricted, circular, tunnel, like, field, vision, imitationspecialtyophthalmology, contents, causes, eyeglass, users, mask, goggle, helmet, us. For other uses see Tunnel vision disambiguation Tunnel vision is the loss of peripheral vision with retention of central vision resulting in a constricted circular tunnel like field of vision 1 Tunnel visionTunnel vision imitationSpecialtyOphthalmology Contents 1 Causes 2 Eyeglass users 3 Mask goggle and helmet users 4 Optical instruments 5 See also 6 References 7 External linksCauses EditTunnel vision can be caused by Glaucoma a disease of the eye 2 Retinitis pigmentosa a disease of the eye 3 Blood loss hypovolemia Alcohol consumption 4 In addition the vision becomes blurred or double since eye muscles lose their precision causing them to be unable to focus on the same object Sustained 1 second or more high accelerations 5 Typically flying an airplane with a centripetal acceleration of up to or over 39 m s2 about 4g with the head towards the center of curvature common in aerobatic or fighter pilots In these cases tunnel vision and greyout may proceed to a g force induced Loss Of Consciousness g LOC Hallucinogenic drugs in particular dissociatives Stimulant drugs that release and or prevent the reuptake of dopamine and norepinephrine in particular amphetamines 6 Extreme fear or distress most often in the context of a panic attack Excitement or extreme pleasure such as on a roller coaster causing a surge of adrenaline in the body During periods of high adrenaline production such as an intense physical fight Altitude sickness hypoxia in passenger aircraft 7 Exposure to oxygen at a partial pressure above 1 5 2 atmospheres producing central nervous system oxygen toxicity called narcosis 8 Other symptoms can include dizziness nausea blindness fatigue anxiety confusion and lack of coordination Pituitary tumours or other brain tumours that compress the optic chiasm Prolonged exposure to air contaminated with heated hydraulic fluids and oils as can sometimes happen in passenger aircraft different from the so called aerotoxic syndrome which is not a recognized medical diagnosis and is claimed to happen with chronic exposure to substances from aircraft engines 7 Severe cataracts causing a removal of most of the field of vision During the aura phase of a migraine Intense anger causing the body to be rapidly flooded with adrenaline and oxygen A bite from a black mamba and other snakes with the same strength venom Mercury poisoning especially methylmercury Sleep deprivation Usher Syndrome Syncope fainting 9 Eyeglass users EditEyeglass users experience tunnel vision to varying degrees due to the corrective lens only providing a small area of proper focus with the rest of the field of view beyond the lenses being unfocused and blurry Where a naturally sighted person only needs to move their eyes to see an object far to the side or far down the eyeglass wearer may need to move their whole head to point the eyeglasses towards the target object citation needed The eyeglass frame also blocks the view of the world with a thin opaque boundary separating the lens area from the rest of the field of view The eyeglass frame is capable of obscuring small objects and details in the peripheral field citation needed Mask goggle and helmet users Edit Wide field wrap around diving mask Diving mask with narrow field of view Extremely large wide field binoculars that would not be practical to carry Activities which require a protective mask safety goggles or fully enclosing protective helmet can also result in an experience approximating tunnel vision Underwater diving masks using a single flat transparent lens usually have the lens surface several centimeters from the eyes The lens is typically enclosed with an opaque black rubber sealing shell to keep out water For this type of mask the peripheral field of the diver is extremely limited Generally the peripheral field of a diving mask is improved if the lenses are as close to the eye as possible or if the lenses are large multi window or is a curved wrap around design citation needed Protective helmets such as a welding helmet restrict vision to an extremely small slot or hole with no peripheral perception at all This is done out of necessity so that ultraviolet radiation emitted from the welding arc does not damage the welder s eyes due to reflections off shiny objects in the peripheral field citation needed Optical instruments EditBinoculars telescopes and microscopes induce an experience of extreme tunnel vision due to the design of the optical components A wide field microscope or telescope generally requires much larger diameter and thicker lenses or complex parabolic mirror assemblies either of which results in significantly greater cost for construction of the optical device citation needed Wide field binoculars are possible but require bulkier heavier and more complex eyepieces The diameter of the objective lenses is unimportant for field of view 10 The widest angle eyepieces used in telescopes are so large that two would not fit side by side for use in binoculars citation needed See also EditTarget fixation a psychological phenomenon where a person at the controls of a vehicle risks inadvertently colliding with a specific object as a result of intensely focusing on it References Edit Definition of Tunnel vision MedicineNet Glaucoma MedlinePlus Medical Encyclopedia www nlm nih gov Retrieved 2016 02 21 Retinitis pigmentosa Genetics Home Reference 2016 02 15 Retrieved 2016 02 21 Effects of Alcohol on Vision Archived 2006 10 08 at the Wayback Machine Virtual Naval Hospital United States Naval Flight Surgeon Manual Third Edition 1991 Chapter 2 Acceleration and Vibration Sustained Acceleration 23 November 2005 Archived from the original on 2005 11 23 Mills Kenneth C Spruill Susan E Kanne Roy W Parkman Katherine M Zhang Ying 5 September 2016 The Influence of Stimulants Sedatives and Fatigue on Tunnel Vision Risk Factors for Driving and Piloting Human Factors The Journal of the Human Factors and Ergonomics Society 43 2 310 327 doi 10 1518 001872001775900878 PMID 11592671 S2CID 6852335 a b Friend Statement 5 October 2006 Archived from the original on 2006 10 05 Virtual Naval Hospital United States Naval Flight Surgeon Manual Third Edition 1991 Chapter 1 Oxygen Toxicity 22 November 2005 Archived from the original on 2005 11 22 Vasovagal syncope www mayoclinic org Retrieved 2020 08 28 Meade Sports Optics How to Select the Right Binocular www meade com External links Edit Retrieved from https en wikipedia org w index php title Tunnel vision amp oldid 1122050952, wikipedia, wiki, book, books, library,
