At present, in ophthalmology we have optical aids for low vision that improve the quality of life of patients suffering from visual limitation. Depending on the specific needs of each person, we have a range of options that facilitate the performance of daily activities that require viewing objects at a close, intermediate or distant distance.
En Área Oftalmológica Avanzada We explain what low vision visual aids consist of, and what options we have.
What are low vision aids?
It is a set of techniques focused on patients with low vision whose main objective is that they can develop, in better conditions, daily activities through visual exercises and / or the use of visual aids such as specific optical systems.
The aid is produced through the magnification and minification technique, which is measured through the maximum level of visual acuity achieved necessary to perform a certain task.
Who can give visual aids?
The most suitable professional to perform visual aids is the low vision expert, who can rely on the own treatments of the visual therapy unit.
To guarantee the success of these aids, it is necessary that during this process an ophthalmological control is carried out to ensure the patient's visual health.
In an ideal environment, where the patient can safely receive low vision visual aids, it is go to an ophthalmological center of recognized prestige where they have a low vision unit and vision therapy.
Types of visual aids
There are different types of optical aids that can be applied depending on the needs of each patient. Among the different resources to treat low vision we find, but not only limited to:
It is used to enlarge the size of those objects that are at a far distance. The telescope can be manual or mounted on glasses, in which case we are talking about prismatic glasses.
The telescope can be monocular, if it is used only in one eye, or binocular if it is in both eyes. If the telescope is mounted on glasses, it is especially useful for static activities such as watching television, while manual telescopes are more useful for dynamic activities such as viewing a shop window from a distance. Keep in mind that cannot be used on the go.
These are high-power positive or convergent lenses, typically aspherical lenses, which they are mounted on glasses for regular use or by clip for occasional use and are especially indicated for patients who need to improve their near vision. In this way, tasks that require a close vision, although they have the disadvantage of needing a very short distance to function properly.
The optical magnifying glass increases the size of objects, allowing short working distances on time. There are different types of magnifiers: focusable, manual, fixed with support, magnifying glasses for glasses, pocket, etc. The main limitation of magnifying glasses is that as their power increases, the campor vision.
Through the telemicroscope ampbundles the size of the retinal image of objects within walking distance, without needing accommodation for it. Through this system we enhance medium and long-distance tasks.
The pros and cons of this technique are the same as in the telescope to which the close-up lens is placed, with the only exception that the working distance varies: in this case, it is reduced as the power to the close-up lens increases.
The electronic systems are integrated by an electronic digital magnifier that acts as a scanner, magnifying the image up to 28 times. It is a very versatile technology since it achieves different sets of contrasts, resolutions and tones.
They prevent glare, adapt to light and increase contrast through the absorption of certain light wavelengths. They also get a improvement in AV visual acuity. It is worth noting their colorations, which can make them draw a bit of attention.
From the almost complete range of therapeutic filters that exist today, two stand out:
They reduce glare to a greater extent when modify the light wave direction selectively.
These filters react depending on the level of sunlight to which they are exposed. They are useful in patients with problems adjusting to variations in the degree of illumination.
Practical advice for patients with low vision
Apart from low vision aids, the patient affected by this problem can perform a series of practices to improve your daily tasks:
- Diminish the sparkles both indoors and outdoors. It is important to dim the lights inside, so that they do not sparkle. Outside of our residence, vision must be protected by wearing large hats or glasses with wraparound frames.
- Give more lighting to the house, replacing the points of light by other more luminous and adding more light bulbs around the house.
- Use markers, pencils and pens with coarse felt tip when making notes or writing the shopping list.
- Increase contrasts in our home, for example putting white plates on a dark tablecloth.
In addition, we show you with an example some tips from the American Society of Ophthalmology, which are essential to improve the quality of life of the patient:
- Low vision analysis performed by an ophthalmologist and an optometrist.
- Device prescription to be used in each case.
En Área Oftalmológica Avanzada we are experts in visual aids for low vision. If you suffer from problems of this type, do not hesitate to contact us, we will be happy to assist you!