A vision screener is a piece of equipment used in laboratories, hospitals, clinics, offices or even homes to evaluate various properties of the eye. They are made of various components constructed from different materials. They have a wide range of applications. Taking for example, when one needs a job that requires good ability to see object close or far from the eye this equipment becomes handy. Such jobs include the military, medicine and electronics among others.
These devices come in various shapes and sizes. Most designs are made in an upright posture to allow them to stand on their own. They have a low center of gravity with a strong base to make them stand without support from elsewhere. The size depends on the purpose of the device. Most sophisticated, high resolution models are very large and may need to remain in one place throughout their life span.
Smaller models have handles at the top for pulling or pushing around. Some come with wheels to ease movement and make them light for movement. They may also be folded to make them compact for movement. Most of them are designed with patient comfort in mind. The patient should not get tired or should not suffer any injuries when using the equipment. Such comfort features include incorporation of standard test illumination.
These equipments are sold with storage cases for safeguarding them when being moved or not in application. The internal surface of the casing is aligned with insulators and cushioning for absorbing shock and insulating. Some makes also contain tables for supporting as they are used. Tables may incorporate cabinets for keeping guides, manuals, reference notes and other materials that are vital during testing. The altitude is normally adjustable and comfortable for users.
Most designs are intended for use by adults and children altogether even though there are some whose use is restricted to either adults or children. They can be utilized while sitting or standing depending on the design. Standing or sitting posture is vital for accurate and effective testing. Daylight conditions and improved slide illumination are provided by steady fluorescent sources of light.
Some tests these equipments can do include, color perception, visual acuity, binocular vision, depth perception and muscle balance which entails horizontal and vertical phoria. Color perception is performed in horizontal visual field at various angles such as 55, 70, 85 and 45degrees for either eye. Most gadgets can also screen sight in night-driving conditions. Sight screeners integrate manual wheels for regulating test slides. Integral membrane switches occlude the eyes and control peripheral vision test illuminations.
Most appliances can perform up to sixteen vision tests. The difference in that number lies in the slide set encompassed on the equipment. Production standards are enforced by various job descriptions and standardizing bodies. Many models of equipment have their spare parts manufactured by independent companies and they can be installed independently.
One should follow the maintenance directions that accompany every vision screener so that they can last and remain functional for a long while. Most companies that manufacture these devices also produce subsequent versions. Subsequent releases normally improve on features included on previous makes.
These devices come in various shapes and sizes. Most designs are made in an upright posture to allow them to stand on their own. They have a low center of gravity with a strong base to make them stand without support from elsewhere. The size depends on the purpose of the device. Most sophisticated, high resolution models are very large and may need to remain in one place throughout their life span.
Smaller models have handles at the top for pulling or pushing around. Some come with wheels to ease movement and make them light for movement. They may also be folded to make them compact for movement. Most of them are designed with patient comfort in mind. The patient should not get tired or should not suffer any injuries when using the equipment. Such comfort features include incorporation of standard test illumination.
These equipments are sold with storage cases for safeguarding them when being moved or not in application. The internal surface of the casing is aligned with insulators and cushioning for absorbing shock and insulating. Some makes also contain tables for supporting as they are used. Tables may incorporate cabinets for keeping guides, manuals, reference notes and other materials that are vital during testing. The altitude is normally adjustable and comfortable for users.
Most designs are intended for use by adults and children altogether even though there are some whose use is restricted to either adults or children. They can be utilized while sitting or standing depending on the design. Standing or sitting posture is vital for accurate and effective testing. Daylight conditions and improved slide illumination are provided by steady fluorescent sources of light.
Some tests these equipments can do include, color perception, visual acuity, binocular vision, depth perception and muscle balance which entails horizontal and vertical phoria. Color perception is performed in horizontal visual field at various angles such as 55, 70, 85 and 45degrees for either eye. Most gadgets can also screen sight in night-driving conditions. Sight screeners integrate manual wheels for regulating test slides. Integral membrane switches occlude the eyes and control peripheral vision test illuminations.
Most appliances can perform up to sixteen vision tests. The difference in that number lies in the slide set encompassed on the equipment. Production standards are enforced by various job descriptions and standardizing bodies. Many models of equipment have their spare parts manufactured by independent companies and they can be installed independently.
One should follow the maintenance directions that accompany every vision screener so that they can last and remain functional for a long while. Most companies that manufacture these devices also produce subsequent versions. Subsequent releases normally improve on features included on previous makes.
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