Ophthalmic advices:Optical aids and low vision assessment

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The low vision is a situation in which the person sees less and this situation can not be corrected using glasses or conventional contact lenses or applying medication or surgery. You have to weigh all the options to try to help the patient in the best way.

Rating of low vision

Vision characteristics are described by two components:

  • The eyesight is a measure of the maximum amount of insight that can be obtained with or without the help of visual aids, whether lenses, magnifiers etc. in order to distinguish objects at a certain distance and is typically measured with a primer in which letters are read separately, if they are all the view points is 100%. In some situations it may decrease the visual acuity vision lost certain letters according to size.
  • The field of view is a measure of quality of vision refers to the angle of vision of the eye, each eye may see 90 °, making a total field of view of both eyes 180 °. In some situations the visual field can be reduced by reducing the sides or no defined spots due to limited viewing pattern.

The full vision in quantity and quality of vision would have a 100% visual acuity and field of view 180 °. Most people do not have a complete picture, but despite this can have a normal life without limitations and not realize, especially if the infringement occurs progressively. The vision below 50% may be limited in some activities and become more marked and noticeable to the patient from a vision below 20%. The legal blindness is considered with lower visual acuity at 10% with a visual field less than 20 °, the blindness is considered when vision is lost completely or is reduced to shadow detection. Although the definitions of blindness can find resources to help people lead as independent a life as possible with them their skills and significantly improve the quality of life.

It is important to make a full assessment of the patient by an ophthalmologist and provide close monitoring. You have to assess the use of lenses, medicine or surgery at all times. You can even use special lenses, for example, lenses that can be used for different activities performed by the patients. Conditions that cause more blindness and low vision are cataract, the glaucoma, the diabetic retinopathy and age-related macular degeneration . Other major causes are high myopia and retinitis pigmentosa. Some of these conditions can be addressed by surgery or drugs by improving the state of the eye and through lenses to correct refractive errors.

Optical aids

It exists an optical aids to improve the quality of life of patients. Any aids can increase the size of the image by different mechanisms of magnifiers and telescopes. Can be improved near and far vision to allow certain activities, for example reading the price of a product, write a note or watch TV. You can enhance contrast sensitivity by using special filters. Computers and digital devices can offer specific programs to increase the size of the images, read the files using a screen reader or Braille by touch. You have to evaluate each case to suit the patient's needs and provide for performance monitoring of optical aids. The vast majority of patients are well suited to optical aids and are very satisfied. The most important advantage is the ability to view each patient the most, in order to offer patients the opportunity to live independently and improve their quality of life.