KLİNİK VƏ SUBKLİNİK KERATOKONUSUN DƏRƏCƏLƏRİNİN DİAQNOSTİKASINDA BUYNUZ QİŞA PARAMETRLƏRİNİN YENİ QİYMƏTLƏNDİRMƏ MEYARLARI

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SUMMARY

Aim. To estimate the changes in the anterior and posterior surfaces of cornea, pachymetric data and changes of
specihc volume of cornea on the eyes with subclinical keratoconus and keratoconus ofl or II stages with the help
of Scheimpflug system.

Material and methods
The investigations were held on the basis of eximer-laser department of the National Centre of Ophthalmology
after acad. Zarifa Aliyeva. The investigation included 78 patients (82 eyes) at the age of 16-49 years of old
(29,3±1,2), from them 41 men and 37 women. There were no previously borne eye diseases or surgical intervention
on the eyes. All patients were divided into 4 groups. The 1st group with keratoconus of 2 stage consisted of 23 eyes
(21 patients), the 2nd group with keratoconus of 1 stage - 24 eyes (22 patients), the 3rd group with subclinical
keratoconus - 15 eyes (15 patients), control group - 20 eyes (20 patients). There were no any biomicroscopically
revealed changes in all patients.

Results and discussion
Using this investigation we’ve revealed the changes of posterior cornea and found the correlations between
changes of anterior surface of cornea, pachymetric indices and indices of corneal volume even in subclinical
cases. It was detected that some parameters were useful for revealing of subclinical and clinical keratoconus. In
particular, the indices of keratometry of anterior corneal surface and indices of astigmatic component of anterior-
posterior corneal surfaces had an expressed sensitivity and specihcity.
On the whole, in the clinical and subclinical keratoconus the high indices of astigmatism of anterior and
posterior corneal surfaces were revealed. We dehned the correlation between astigmatism indices of anterior and
posterior surfaces in all investigated groups.

Conclucions
So, analysis of indices of keratometry of anterior corneal surface has the decisive signihcance in keratoconus
diagnosis. Such parameters as asphericity and sphericity posess with weak diagnostic criteria for keratoconus
diagnostics. Possibly it’s accounted by that these indices inform us about common corneal surface, not revealing
local changes of cornea that is necessary for detecting of initial changes of corneal ectasia.