How to choose lenses for the eyes

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How to choose lenses for the eyes

In the mod­ern world, many peo­ple refuse to wear glass­es in favor of con­tact lens­es. With the right selec­tion, they are com­fort­able to wear and fair­ly easy to care for. But it’s impor­tant to choose the right ones.
How to choose lenses for the eyes
Before buy­ing lens­es for the eyes, go to an oph­thal­mol­o­gist. Pho­to: Shut­ter­stock

Con­tact lens­es are con­sid­ered one of the best ways to cor­rect vision. They allow you to lead an active lifestyle, play sports. Com­pared to glass­es, they do not lim­it the field of view, do not fog up when enter­ing a warm room from a cold street.

But for the selec­tion of con­tact lens­es, you must first vis­it an oph­thal­mol­o­gist. Self-cor­rec­tion can lead to com­pli­ca­tions and even dete­ri­o­ra­tion, rather than improve­ment of vision.

You can check your eye­sight in a munic­i­pal poly­clin­ic, in pri­vate mul­ti­dis­ci­pli­nary med­ical cen­ters or spe­cial­ized oph­thal­mo­log­i­cal clin­ics, as well as in optics salons where there is an oph­thal­mol­o­gist.

If opti­cal vision cor­rec­tion is required, the oph­thal­mol­o­gist will select glass­es and/or con­tact lens­es. And this is not only diopters, but also some oth­er indi­ca­tors. So what are the steps involved in fit­ting con­tact lens­es?

Visit to the doctor

The most impor­tant step is a vis­it to the oph­thal­mol­o­gist. You need to start with what com­plaints you have — visu­al impair­ment, and the dynam­ics of its changes (how quick­ly and for how long vision dete­ri­o­rates, it is hard to see near or far).

It is also nec­es­sary to clar­i­fy whether there are headaches, dizzi­ness, a feel­ing of pres­sure in the eyes and oth­er com­plaints, to note whether there are close rel­a­tives with poor eye­sight or eye dis­eases and which ones — myopia, hyper­me­tropia, astig­ma­tism, glau­co­ma, reti­nal pathol­o­gy, etc. ).

On a note!

Lens­es, glass­es or laser: choose a method of vision cor­rec­tion with doc­tors

Determination of the radius of curvature and the diameter of the cornea

In addi­tion to the pow­er of the lens (diopters), oth­er indi­ca­tors are also nec­es­sary for con­tact lens­es — this is the so-called basic cur­va­ture, which depends on the radius of the cornea, as well as the diam­e­ter.

The base cur­va­ture of most com­mer­cial­ly avail­able con­tact lens­es ranges from 8–9 mm. Depend­ing on the basic cur­va­ture of the lens and the shape of the cornea, the fit of a con­tact lens can be nor­mal, flat or steep.

With a flat fit, the lens will be too mobile and move eas­i­ly when blink­ing, caus­ing dis­com­fort. With a steep (or tight) fit, the lens is prac­ti­cal­ly immo­bile, which does not cause obvi­ous dis­com­fort, but can cause com­pli­ca­tions lat­er.

After deter­min­ing all the nec­es­sary para­me­ters, the doc­tor gives a pre­scrip­tion for con­tact lens­es. With it, you go to the optics salon, acquir­ing the lens­es that suit you.

On a note

Extend­ed wear lens­es: how to choose the best

Trying on contact lenses

In most salons there is such a ser­vice as a tri­al fit­ting of lens­es. If you then buy lens­es, it’s usu­al­ly free. Try­ing on lens­es is rec­om­mend­ed for sev­er­al impor­tant rea­sons:

    the doctor tells in detail and shows in practice how to properly put on and then remove lenses, talks about the rules of wearing and care;
    if itching, discomfort or tearing, severe dryness is felt, others are selected according to the material or parameters of the lens.

Popular questions and answers

We dis­cussed with oph­thal­mol­o­gist Kse­nia Kaza­ko­va ques­tions about the selec­tion of lens­es, the dura­tion of their wear­ing, the rules for putting on and tak­ing off, car­ing for lens­es.

What type of lens to choose?

Mod­ern soft lens­es are pro­duced from two types of mate­ri­als — hydro­gel or sil­i­cone hydro­gel.

Hydro­gel lens­es — This is an old­er gen­er­a­tion of prod­ucts, they have both their plus­es and cer­tain minus­es. The hydro­gel is part­ly com­posed of water, so the lens­es are flex­i­ble and quite soft. But they are not able to pass oxy­gen through them­selves, the cornea receives it in dis­solved form from the water con­tained in the lens. With pro­longed wear­ing of con­tact lens­es, the cornea dries up and dis­com­fort occurs, so the peri­od of con­tin­u­ous wear­ing is lim­it­ed — about 12 hours. In such lens­es, in no case is it allowed to sleep.

Sil­i­cone hydro­gel lens­es due to the con­tent of sil­i­cone in their com­po­si­tion, oxy­gen is passed to the cornea, they can be com­fort­ably worn dur­ing the day, sleep is allowed in them, and some are allowed for pro­longed wear (sev­er­al days con­tin­u­ous­ly).

How often should lenses be changed?

It all depends on the type of lens.

Dai­ly lens­es the most com­fort­able and safe, but their price is high­er than all the oth­ers. In the morn­ing, you open new lens­es, put them on and wear them all day, before going to bed, take them off and throw them away. They are the eas­i­est to take care of. They do not require clean­ing and treat­ment with spe­cial solu­tions. These lens­es are espe­cial­ly good for peo­ple with a pre­dis­po­si­tion to aller­gies and fre­quent inflam­ma­to­ry eye dis­eases.

Planned replace­ment lens­es — This is one of the most com­mon options. They are worn for a peri­od of 2 weeks to 3 months. You need to put on lens­es in the morn­ing, wear them dur­ing the day, remove them before going to bed and put them in a con­tain­er with spe­cial solu­tions. It helps to clean the lens­es and keep them moist, which grad­u­al­ly decreas­es.

Extend­ed wear lens­es can be used up to 7 days con­tin­u­ous­ly with­out removal. After that, they are removed and thrown away. If it is nec­es­sary to remove the lens­es dur­ing this peri­od, they are also placed in a solu­tion that cleans and dis­in­fects before the next putting on.

Can I wear colored lenses?

Yes, it’s allowed. But it is rec­om­mend­ed to wear them no more than 6 — 8 hours. A sim­ple lens is turned into a col­ored one by apply­ing pig­ment to one of the sur­faces. Pro­teins from the lacrimal flu­id are deposit­ed in the area where the pig­ment is applied, so they need to be cleaned more thor­ough­ly and looked after more close­ly. There are mod­els that com­plete­ly change the col­or of the eyes or only enhance the shade of the nat­ur­al col­or.

Are there restrictions on wearing lenses?

Although lens­es are con­ve­nient and com­fort­able, there are a num­ber of con­traindi­ca­tions to their use. For exam­ple, they include:

● infec­tious eye dis­eases (con­junc­tivi­tis, ble­phar­i­tis, ker­ati­tis, etc.);
● hyper­sen­si­tiv­i­ty of the eyes;
aller­gy;
● acute rhini­tis (run­ny nose) and SARS.

What should be the first lenses for the eyes?

The first lens­es must be select­ed by an oph­thal­mol­o­gist — it is unac­cept­able to take lens­es from friends or just buy them your­self, this can lead to seri­ous com­pli­ca­tions. If the lens­es are incor­rect­ly select­ed, such a seri­ous dis­ease as ker­ati­tis (inflam­ma­tion of the cornea) can devel­op, not to men­tion the opti­cal para­me­ters and the impact on vision.

If we talk about the mode of wear­ing, then it is bet­ter to start with dai­ly lens­es — they do not require main­te­nance. In addi­tion, at first it can be dif­fi­cult to put on and take off lens­es, they can break, if you have dis­pos­able lens­es, you always have spare ones on hand.

How to insert lenses into the eyes?

The oph­thal­mol­o­gist will teach you how to put on and take off the lens­es cor­rect­ly dur­ing the first selec­tion. To help the patient, there are edu­ca­tion­al instruc­tions with visu­al pic­tures and video tuto­ri­als.

There are sev­er­al meth­ods and how to put on a lens and how to remove it, which one is suit­able — depends on the indi­vid­ual patient.

How to remove lenses from eyes?

The most impor­tant con­di­tion is the obser­vance of hygiene rules: it is nec­es­sary to wash and dry your hands both before putting on lens­es and before remov­ing them.

By Yraa

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