Night vision restoration lenses

2023 Author: Alfred Shackley | [email protected]. Last modified: 2023-05-21 13:14

Progress does not stand still - new methods and drugs are constantly being developed that help to cope with health problems with the least amount of effort on the part of patients. Night vision correction lenses are optical accessories that work while the patient is resting.

These special rigid structures of a special shape - reverse geometry - are designed for corneal refractive therapy (CRT - Corneal Refractive Therapy). Night vision correction is the most progressive method for treating hyperopia and myopia.

For those who lead an active lifestyle, glasses or lenses cause inconvenience - they fly off, interfere with fast movement.

Young people are complex because of glasses - they are shy about eyepieces and are embarrassed to get to know those they like.

Since orthokeratological lenses restore vision at night, it is possible to do without optical aids during the day.

The specific design of the accessories allows you to restore visual function for 14-20 hours, and then at night, for 6-8 hours, they are put on again and visual problems are eliminated again.

Additional correction to improve vision is not required while the lenses are in use.

In order for visual acuity to remain at the required level, and the organs of the eye to be restored in full, it is necessary to use an optical accessory every day.

Lenses at night - vision correction

Why does visual acuity change in patients with myopia? In patients with normal vision, the light beam is focused in the center of the retina. With ophthalmic problems, the light beam is displaced. It is possible to eliminate the displacement by changing the curvature of the cornea - which is what night lenses do.

While a person is sleeping, medical optics presses on the center of the cornea from the outer surface, and it flattens. The cornea changes its shape and maintains these changes for 10-16 hours. The image is focused on the center of the retina and no further correction is required.

However, over the course of the day - since the lens is no longer exposed to anything - it returns to its original shape.

Differences between night vision correction accessories from ordinary contact ones:

• made of tough material - with a lot of silicone, although they are gas permeable;
• have a special shape - they do not adapt to the curvature of the cornea, but, on the contrary, they bend it;
• they are difficult enough to pick up, and not easy to get used to.

The main functions of the optics of this design: treatment of myopia, astigmatism, mechanical protection of the cornea, maintenance of moisture - that is, a therapeutic effect and providing comfortable conditions for the eyes at night.

Selection of orthokeratological lenses

Such optical accessories are not purchased on their own.

The optometrist writes out a prescription after the following procedures:

• keratotopography - examines the power of refraction of light on the surface of the cornea and draws up its topographic map
• keratometry - with the help of this study, the surface of the cornea is assessed from the front side, the optical power of the accessories is determined;
• diagnose keratoconus - this term is called a non-inflammatory ophthalmic disease of non-infectious etiology (degenerative), the main symptom of which is the thinning of the cornea and the acquisition of the shape of a cone.

Then they find out the main contraindications for using optical accessories for this type of correction:

• dry eye syndrome in the decompensated stage;
• decreased sensitivity of the cornea;
• acute and chronic eye diseases;
• corneal astigmatism from 1.75 diopters;
• lagophthalmos;
• eye injuries, including eyelids;
• infectious diseases of a general nature, in which the temperature rises;
• age under 6 years old;
• a low threshold for the release of lacrimal fluid (in other words, for those who constantly have their eyes "in a wet place").

Relative contraindications are: itching, increased lacrimation, a feeling of "sand" under the eyelids, pain. Why are these contraindications considered relative?

They appear when using any contact lenses, if the latter do not fit or there is an individual intolerance to them.

If a new selection, change in material, more careful eye and accessory care does not eliminate the side effects, then we can conclude that a different method should be chosen for vision correction.

The selection of night contact lenses begins only after an accurate description of the clinical picture. In some cases, the patient has to try dozens of models.

You should not expect improvement immediately after the first - or even after the second - night. The desired effect (with myopia from 2 diopters) is achieved after 2-3 weeks of use. During these adaptation weeks, the patient experiences severe discomfort: he is irritated by bright light, lacrimation begins, doubling of objects may periodically occur … By the end of this period, the discomfort should be completely eliminated. If this did not happen, then the night correction method should be abandoned.

Orthokeratological contact lenses - features of use

The use of optical accessories is coordinated with an ophthalmologist - every night or at intervals of a day.

Before putting on the vision correction device, wash your hands with soap and water and dry thoroughly. Then they sit down in front of the mirror and begin actions from the side of the working hand - the lenses have the same designations as the shoes - right and left.

The "glass" is taken out of the container and placed on the pad of the index finger or taken with a special pipette. The lower eyelid is pulled back and the curved surface touches the eyeball. You need to try to "stick" to the very center - otherwise side effects appear: lacrimation, blurred vision.

Before removing optical accessories, you need to use special drops - this will increase the amount of fluid on the surface of the cornea and make it easy to get rid of the medical accessory.

The eyelids are also pushed apart, pulling the lower one, then a special remover is brought to the lens, pressed, and carefully removed. The action can also be carried out with your fingers.

You need to take care of night contact lenses in the same way as for ordinary ones - be sure to clean with special detergents, wipe the inside, rinse and place in an antiseptic solution. The solution must be changed as often as indicated in the instructions.

Proper hygienic care of optical accessories is the foundation of eye health.

If you neglect any action - do not clean the optics, do not change the solution - then there is a high risk of contracting a bacterial or fungal infection. The antiseptic rules also include recommendations for replacing optics and accessories. The storage container needs to be replaced every 3 months, the stripper and pipette - every six months, the optical accessories themselves at least once a year (unless a different period of use is specified in the instructions).

To keep your eyes always healthy, and your vision does not deteriorate, you need to visit a doctor after the first night in the lenses and then check your visual acuity, first once a week, and then once a month.

If there is an improvement in the daytime, but discomfort is felt at night, you should also consult a doctor.