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ARTICLE
Year : 1965  |  Volume : 13  |  Issue : 2  |  Page : 79-80

Unusual high astigmatism in aphakia


Indore, India

Date of Web Publication21-Feb-2008

Correspondence Address:
B K Dhir
Indore
India
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Source of Support: None, Conflict of Interest: None


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How to cite this article:
Dhir B K. Unusual high astigmatism in aphakia. Indian J Ophthalmol 1965;13:79-80

How to cite this URL:
Dhir B K. Unusual high astigmatism in aphakia. Indian J Ophthalmol [serial online] 1965 [cited 2020 Sep 23];13:79-80. Available from: http://www.ijo.in/text.asp?1965/13/2/79/39222

Usually emmetropic eyes after re­moval of cataracts require about +10.0 Dsph with about +1 to 3 D cyl for correcting the refractive error. The aphakic eye is the simplest form of optical system, i.e., a single curved surface of cornea separating the air from the aqueous and vitreous, both of which may be regarded as a single medium, since they have about the same refractive index. According to a large number of ophthalmologists, the average astigmatism does not exceed 3 D. The astigmatism depends upon the following factors:-

  1. type of the corneal section
  2. whether corneo-scleral sutures are applied or not
  3. type of corneo-scleral suture
  4. time of refraction after opera­tion.


Groenholm, in his study of kerato­metric measurements in aphakia, ob­served that

a. astigmatism was highest in apha­kia, in which no sutures were applied, less in Leigard suture cases, and least in two corneo­scleral suture cases.

b. astigmatism was maximum after 10 days of operation and was reduced to half after two months.

Floyd records that astigmatism is markedly reduced in most of the cases during the two months period after operation. In one case, high astigma­tism of 7 to 8 D was recorded even after six months of operation. He also noticed that final flattening of the cornea is slightly increased in cases, in which vitreous was lost during opera­tion.

O'Brien recorded less amount of astigmatism in Keratome and scissors section method, as compared to sec­tioning by knife. He recorded high astigmatism (upto 7D) in two cases insection by keratome and scissors and in ten cases by the knife.


  Case Reports Top


Case No. 1. Mr. M. P. O. aged 73 years was operated for senile mature cataract in the left eye, with a knife section, one corneo-scleral suture (Leigard), one peripheral button-hole iridectomy and intracapsular extrac­tion with forceps.

Post-operative recovery was uneventful. Visual acuity with:



Case No. 2. Mr. A. P. V. aged 71 years was operated for senile mature cataract in the right eye, with two corneo-scleral buried sutures, with Aruga's virgin silk following a kera­tome and scissors section. Two peri­pheral button-hole iridectomies were done, the extraction was intracapsular with enzymatic zonulysis. Post-opera­tive recovery was uneventful. After two months the visual acuity was with



Case No. 3. Mr. G. A. aged 50 years operated for senile immature cataract, with a keratome-scissors sec­tion, two corneo-scleral sutures and intracapsular extraction with enzyma­tic zonulysis. Post-operative recovery was uneventful. After two months the visual acuity was with




  Summary & Conclusions Top


  1. Three cases of unusually high astigmatism are recorded. No reference was available of any recorded case, which has more degree of astigmatism than case No. 1.[3]
  2. No exact cause for this high astigmatism was detected.
  3. No visual difficulty was com­plained of by any of the above patients after use of the glasses.


My thanks are due to Dr. Rathore in his help in following up and in the compilation of these cases.

 
  References Top

1.
Cowan, A. (1934) Arch. Ophth. 12: 571.  Back to cited text no. 1
    
2.
Floyd, G. (1951) Am. J. Ophth. 34:1525.  Back to cited text no. 2
    
3.
O'Brian (1943) Am. J. Ophth. 26: 508, 1943.  Back to cited text no. 3
    




 

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