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   Table of Contents      
ARTICLES
Year : 1981  |  Volume : 29  |  Issue : 3  |  Page : 255-256

Surgical correction of astigmatism


Deptt. of Ophthalmology, S.V.M. Medical College, Kanpur, India

Correspondence Address:
K K Gupta
Deptt. of Ophthalmology, S.V.M. Medical College, Kanpur
India
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Source of Support: None, Conflict of Interest: None


PMID: 7346439

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How to cite this article:
Gupta K K, Srivastava S K, Pandey D J, Kastury S K. Surgical correction of astigmatism. Indian J Ophthalmol 1981;29:255-6

How to cite this URL:
Gupta K K, Srivastava S K, Pandey D J, Kastury S K. Surgical correction of astigmatism. Indian J Ophthalmol [serial online] 1981 [cited 2020 Nov 24];29:255-6. Available from: https://www.ijo.in/text.asp?1981/29/3/255/30896

It is a common observation that corneal scarring, either traumatic or surgical results in varying degree of astigmatism which led the authors to believe that if a scar if produced in certain meridian at the cornea it would result in the flattening of that meridian and it would reduce or eliminate the extent of astigmatism.


  Materials and methods Top


Based on the above hypothesis we selected cases of high astigmatism and studied them in detail in relation to the corneal curvatures in the axis of maximum and minimum corneal curvatures, the degree of astigmatism with subjective acceptance and the corrected visual acuity by Snellens chart. Thereafter the patients were subjected to three types of scar patterns as follows.

Group I

In this group a simple parallel corneal incision was made nearly 0.5-0.6 mm. in depth in peripheral corneal with the help of Castroviejos' twin keratoplasty knife 4 mm. long in the meridian of greater conreal curva­ture.

Group II

In this group two parallel incisions were given similar to the group I about 1.00 mm. apart and the intervening conreal layer was removed and allowed to heal.

Group III

Ab externo limbal incision was made at the upper and of the meridian of greater curvature by a Bard-Parker knife to a depth of approxi­mately 1 mm. but without entering the anterior chamber.

These patients were followed upto a period of eight weeks at weekly interval when corneal curvatures were measured by Javal Schiot's keratometer and its resultant effect on the astigmatism.


  Observations Top


In first group of 6 cases, where a single parallel scar was made the average reduction in astigmatism was less than one diopter and in the second group of 8 cases, 7 cases had an reduction in between 2-3 diopters and in one case it was between 1-2 diopters. Whereas in the third group of 8 cases only one had reduc­tion between 2-3 diopters and 7 had reduction between 1-2 diopters in respective astig­matsm.

It is evident that reduction in corneal cur­vature with the corresponding decrease in the astigmatism is maximum in the second group of cases where the intervening corneal tissue was excised resulting in greater cicatrization.


  Discussion Top


The operative procedures in the present study are simple and safe in all the 22 cases the corneal incisions healed without any com­plication and all the eyes became quiet within 10-12 days.

The maximum correction of astigmatism was achieved in the group of cases where two parallel scars were made in the peripheral cornea, and even the deep single limbal inci­sion was able to reduce astigmatism only by 2 diopters. A simple single incision and scar could reduce astigmatism to the maximum of only 1 diopter.

The authors are of the opinion that a simple corneal scar in the peripheral cornea or limbus provides a safe easy and cosmatically acceptable surgical treatment of astigmatism.


  Summary Top


Surgical correction of Astigmation is attempted at upper limbus and observations are discussed.




 

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