|Year : 1965 | Volume
| Issue : 2 | Page : 79-80
Unusual high astigmatism in aphakia
|Date of Web Publication||21-Feb-2008|
B K Dhir
Source of Support: None, Conflict of Interest: None
|How to cite this article:|
Dhir B K. Unusual high astigmatism in aphakia. Indian J Ophthalmol 1965;13:79-80
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:-
- type of the corneal section
- whether corneo-scleral sutures are applied or not
- type of corneo-scleral suture
- 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|| |
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|| |
- 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.
- No exact cause for this high astigmatism was detected.
- 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|| |
Cowan, A. (1934) Arch. Ophth. 12: 571.
Floyd, G. (1951) Am. J. Ophth. 34:1525.
O'Brian (1943) Am. J. Ophth. 26: 508, 1943.