Types of refraction

Clinical classification of myopia

Principle of correction of hyperopia

Myopia of low degree Under (-) 3.0 diopters

Myopia of moderate degree From (-) 3.0 to (-) 6.0 diopters

Myopia of high degree Higher than (-) 6.0 diopters

Hyperopia of low degree Under (+) 2 dioptersHyperopia of moderate degree From (+)2 to (+) 5 dioptersHyperopia of high degree Higher than (+) 5 diopters

Complications of hypermetropy

Accomodative astenopy

Sty,

Conjunctivitis, Blefaritis. Pseudoneuritis

Concomitant convergent strabismus

Complicated myopia

Myopic cone Myopic staphyloma External squint Hemorrhages in vitreous

Intraretinal hemorrhages

Retinal detachment

Posterior staphyloma in the beginning myopia

Myopic cone

Scimitar tear of ocular choroid

Tear of ocular choroid

Druses of vitreous lamina

Tear of ocular choroid

True staphyloma of sclera at myopia of high degree

Choroiditis at myopia

Ocular fundus at myopia of high degree

Ocular fundus at myopia of high degree

Hemorrhage in the macula at myopia of high degree

Macular pigmentation in place of older recurrent hemorrhages at myopia of high degree

ILLUSTRATED REVIEW OF LASIK TECHNIQUE

With the help of mechanic instrument – microkeratom – a round flap is opened in the protective layer of cornea.

Upper layers of corneal stroma are evaporated by eximer laser on the necessary for accurate focusing depth.

ILLUSTRATED REVIEW OF LASIK TECHNIQUE

ILLUSTRATED REVIEW OF LASIK TECHNIQUE

In the result of operation the form of cornea became planer. Saved natural layer provides quick rehabilitation of patient.

1.1. SPECTACLES AND CONTACT LENSESSPECTACLES AND CONTACT LENSES

2.2. SURGICAL INTERVENTIONSURGICAL INTERVENTION

3. LASER CORRECTION3. LASER CORRECTION

Refractive errors correction

SHORT VISION RECOVERY SHORT VISION RECOVERY PERIODPERIOD

POSSIBILITY TO MAKE SURGERY POSSIBILITY TO MAKE SURGERY ON BOTH EYES ON BOTH EYES SIMULTANEOUSLY SIMULTANEOUSLY

STABLE POSITIVE RESULTSTABLE POSITIVE RESULT

LASIC ADVANTAGESLASIC ADVANTAGES

CORNEAL SURFACE BEFORE CORNEAL SURFACE BEFORE AND AFTER LASIKAND AFTER LASIK

ADVANTAGES:

POSSIBILITY TO CORRECT MYOPIA UP TO 5 DIOPTERS

DISADVANTAGES: LONG REHABILITATION PERIODRISK OF DEVELOPMENT OF WRONG

ASTIGMATISM

RADIAL KERATOTOMYRADIAL KERATOTOMY

Many scientists made attempts to use light beam in ocular diseases. The first to realize this idea was Myer-Schwickerath in 1947. This date may be considered as the beginning of clinical use of photocoagulation in ophthalmology. Meyer-Schwickerath used xenon lamp of high pressur as a powerful source of light.

LASER OPHTHALMOLOGY

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