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.
Vision screeners come in various dimensions and shapes. Many designs are made upright to let them stand without external support. They have low center of gravity CoG with a steady base since they are utilized from a height. The size varies with the application the equipment is put to. Sophisticated, high resolution versions are big and may have to be installed at one point throughout their functional 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 have storage cases for safe-keeping when on transit or not in use. The interior surface of the cases has cushioning and insulators for shock absorption and insulation. Some models also have tables for placing them when in use. Tables may incorporate side cabinets for keeping reference notes, guides, manuals and other important materials that are necessary during testing. The level of elevation is usually adjustable and comfortable for the user.
Most designs are made for use by both children and adults although there are some that are particularly intended fro use by kids or adults. They may be used while standing or when sitting depending on the design. User posture is very important for efficient and accurate testing. Daylight conditions and improved slide illumination is provided by stable fluorescent light sources.
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.
The amount of vision tests provided by many screeners goes up to around sixteen. The distinction is in the kind of slide set chosen. Standards that have to be met in manufacturing these devices are enforced by various organizations and requirements for various job descriptions. Many types of equipment have independent accessories that can be substituted failing ones.
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.
Vision screeners come in various dimensions and shapes. Many designs are made upright to let them stand without external support. They have low center of gravity CoG with a steady base since they are utilized from a height. The size varies with the application the equipment is put to. Sophisticated, high resolution versions are big and may have to be installed at one point throughout their functional 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 have storage cases for safe-keeping when on transit or not in use. The interior surface of the cases has cushioning and insulators for shock absorption and insulation. Some models also have tables for placing them when in use. Tables may incorporate side cabinets for keeping reference notes, guides, manuals and other important materials that are necessary during testing. The level of elevation is usually adjustable and comfortable for the user.
Most designs are made for use by both children and adults although there are some that are particularly intended fro use by kids or adults. They may be used while standing or when sitting depending on the design. User posture is very important for efficient and accurate testing. Daylight conditions and improved slide illumination is provided by stable fluorescent light sources.
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.
The amount of vision tests provided by many screeners goes up to around sixteen. The distinction is in the kind of slide set chosen. Standards that have to be met in manufacturing these devices are enforced by various organizations and requirements for various job descriptions. Many types of equipment have independent accessories that can be substituted failing ones.
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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