Lenses for astigmatism in adults

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Lenses for astigmatism in adults

Con­tact lens­es have been used to cor­rect vision in astig­ma­tism not so long ago. With the right selec­tion of lens­es, togeth­er with the doc­tor, tak­ing into account the indi­vid­ual char­ac­ter­is­tics of the eye, vision prob­lems can be suc­cess­ful­ly cor­rect­ed.
Lenses for astigmatism in adults
Lens­es for astig­ma­tism in adults Pho­to: Shut­ter­stock

Can lenses be worn with astigmatism?

Astig­ma­tism is a spe­cif­ic oph­thalmic dis­ease in which there is no sin­gle point of focus­ing rays on the reti­na. This is due to the irreg­u­lar shape of the cornea, and much less often — the shape of the lens.

The nor­mal cornea has a smooth con­vex spher­i­cal sur­face. But with astig­ma­tism, the sur­face of the cornea has anatom­i­cal fea­tures — it is irreg­u­lar, not spher­i­cal in shape. It has a toric shape in the cen­ter, so the stan­dard meth­ods of vision cor­rec­tion with con­tact lens­es will not work for the patient.

Con­tact lens­es have been used in oph­thal­mol­o­gy for a long time, but until recent­ly they were not rec­om­mend­ed for patients with astig­ma­tism. This is due to the fact that due to severe or seri­ous visu­al impair­ments, a full fit on the cornea of ​​stan­dard lens­es for cor­rect­ing visu­al acu­ity in patients with astig­ma­tism was dif­fi­cult. Stan­dard lens­es for these patients did not give the desired effect, brought dis­com­fort dur­ing use and could wors­en the con­di­tion of the visu­al ana­lyz­er.

Today, oph­thal­mol­o­gists use spe­cial lens­es, toric lens­es, to cor­rect mod­er­ate and high degree visu­al impair­ment in this pathol­o­gy. The out­er or inner sur­face of such lens­es has a spe­cial shape. Toric lens­es cor­rect corneal astig­ma­tism up to 6 diopters or lens astig­ma­tism up to 4 diopters.

Which lenses are best for astigmatism

Cor­rect­ing visu­al impair­ment in the pres­ence of astig­ma­tism is helped by cor­rec­tion glass­es or the use of con­tact lens­es. When choos­ing the type of cor­rec­tion, it is nec­es­sary to take into account sev­er­al cri­te­ria — this is the type of astig­ma­tism, as well as its stage, fea­tures of visu­al impair­ment. With a mild degree, cor­rec­tion is pos­si­ble due to the use of cylin­dri­cal lens­es or con­tact cor­rec­tion with prod­ucts with an aspher­i­cal shape.

With a com­plex form of astig­ma­tism, for exam­ple, with its mixed type, cylin­dri­cal lens­es will not solve the prob­lem, since the pathol­o­gy of refrac­tion may be accom­pa­nied by hyper­me­tropia or myopia. If there is astig­ma­tism with myopia, the pic­ture is focused in two points, not reach­ing the reti­na. With astig­ma­tism, which is accom­pa­nied by far­sight­ed­ness, two points of focus of the image are formed behind the reti­na. Lens­es hav­ing a toric shape can help in cor­rect­ing this defect.

What is the difference between astigmatism lenses and regular lenses?

For con­tact cor­rec­tion, spher­i­cal, toric, aspher­i­cal or mul­ti­fo­cal lens­es can be used. Con­ven­tion­al prod­uct options will not cope with myopia or hyper­opia, a per­son will notice a dis­tor­tion of the pic­ture on the periph­ery of the image.

To the point

How to choose the best lens­es: advice from doc­tors

Aspher­i­cal lens­es cor­rect vision much more effec­tive­ly, widen­ing view­ing angles due to a snug fit to the cornea and repeat­ing its abnor­mal shape. Such lens­es com­pen­sate for astig­ma­tism with­in 2 diopters, but they can­not cor­rect more severe degrees. To solve this prob­lem, already spher­i­cal types of lens­es are used.

How do lens­es with this pathol­o­gy dif­fer from ordi­nary ones? They can be imag­ined as an ordi­nary ball, which was squeezed from both sides by hands. Where the sur­face of the ball is com­pressed, its cur­va­ture is more pro­nounced than from the side sur­faces, but on the out­side there remains a sur­face in the form of a hemi­sphere. It is the same with lens­es, due to a sim­i­lar shape, they form two opti­cal cen­ters at once. With the pas­sage of light rays, not only the main prob­lem of vision is cor­rect­ed, but also the accom­pa­ny­ing near­sight­ed­ness or far­sight­ed­ness.

Lens Fitting Tips

In the pres­ence of astig­ma­tism, the selec­tion of lens­es should be car­ried out only by an oph­thal­mol­o­gist. It mea­sures a num­ber of stan­dard indi­ca­tors — lens diam­e­ter, radius of cur­va­ture, as well as opti­cal pow­er and cylin­der axis for con­tact lens­es. In addi­tion, it is nec­es­sary to cor­rect­ly select the method of sta­bi­liz­ing the prod­uct in the eye so that the toric lens is clear­ly fixed on the sur­face of the cornea. Any slight dis­place­ment pro­vokes a sharp dete­ri­o­ra­tion in the image.

Mod­ern toric lens­es are pro­duced using var­i­ous sta­bi­liza­tion tech­niques:

    the presence of ballast — the lens has a small area of ​​compaction in the area of ​​​​the lower edge: if a person keeps his head in a straight position, the lens will stand correctly, but when the head is tilted or the position of the body changes, the lenses will shift, the image will begin to blur (today such lenses are no longer produced );
    cutting off a certain edge of the lenses so that they stabilize with the natural pressure of the eyelids — such products can move when blinking, but then restore the correct position again;
    the presence of periballast — these lenses have thin edges, they have four sealing points that help keep the lens in the desired position without restricting motor activity.

What lens options are acceptable for astigmatism

There are many types of con­tact lens­es avail­able today. These can be dai­ly toric lens­es with a high lev­el of com­fort. They cor­rect astig­ma­tism in par­al­lel with far­sight­ed­ness and near­sight­ed­ness.

To the point

When you want a change in appear­ance, col­ored con­tact lens­es can come in handy.

Month­ly lens­es are also used — they are cheap­er than dai­ly ones and have high opti­cal para­me­ters.

Reviews of doctors about lenses for astigmatism

– The choice of a method for cor­rect­ing astig­ma­tism remains with the patient, depends on his lifestyle, age, work per­formed, – says oph­thal­mol­o­gist Olga Glad­ko­va. – Toric lens­es allow you to get clear­er vision com­pared to spec­ta­cle cor­rec­tion of astig­ma­tism. Do not for­get about con­traindi­ca­tions for wear­ing con­tact lens­es, such as inflam­ma­to­ry dis­eases of the ante­ri­or seg­ment of the eye, dry eye syn­drome, when the use of con­tact lens­es is exclud­ed.

Popular questions and answers

We asked ques­tions oph­thal­mol­o­gist Olga Glad­ko­va regard­ing wear­ing lens­es in the pres­ence of astig­ma­tism in com­bi­na­tion with oth­er vision prob­lems.

Can regular lenses be worn with astigmatism?

With a weak degree of corneal astig­ma­tism (up to 1.0 diopters), it is pos­si­ble to wear ordi­nary con­tact lens­es.

Who should wear contact lenses for astigmatism?

Con­traindi­ca­tions: inflam­ma­to­ry dis­eases of the ante­ri­or seg­ment of the eye (con­junc­tivi­tis, ble­phar­i­tis, ker­ati­tis, uveitis), dry eye syn­drome, lacrimal duct obstruc­tion, decom­pen­sat­ed glau­co­ma, ker­a­to­conus.

How should lenses be worn for astigmatism?

Like reg­u­lar con­tact lens­es, toric lens­es should be removed at night and should not be worn for more than 8 hours a day.

By Yraa

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