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ARTICLES
Year : 1971  |  Volume : 19  |  Issue : 4  |  Page : 166-168

Ocular changes following cataract extraction : Effect on ocular rigidity


Aligarh Muslim University Institute of Ophthalmology and Jawaharlal Nehru Medical. College, Aligarh, India

Correspondence Address:
K Nath
Aligarh Muslim University Institute of Ophthalmology and Jawaharlal Nehru Medical. College, Aligarh
India
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Source of Support: None, Conflict of Interest: None


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How to cite this article:
Nath K, Vaid R L. Ocular changes following cataract extraction : Effect on ocular rigidity. Indian J Ophthalmol 1971;19:166-8

How to cite this URL:
Nath K, Vaid R L. Ocular changes following cataract extraction : Effect on ocular rigidity. Indian J Ophthalmol [serial online] 1971 [cited 2020 May 28];19:166-8. Available from: http://www.ijo.in/text.asp?1971/19/4/166/35008

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Dreager [1] and Gloster [2] reported a decrease in ocular rigidity after glaucoma operations, particularly cyclo-diathermy. Yunossada [4] and Miller, KeskY and Becker [3] , after a study of 85 cases and 20 cases respectively observed that ocular rigidity was not significantly af­fected following cataract surgery. The present study was undertaken to assess the effect of uncompli­cated cataract extraction on the ocular rigidity.


  Material and Method Top


33 cases of uncomplicated senile cataracts, including the present study, were screened to rule out the possibility of any other concurrent ocular disease. Ocular rigidity was graphically deter­mined by the friedenwal (1955) nomogram. The intra-ocular pressure was recorded, both by applanation and electronic Schiotz (5.5 gm.) tonometer. Applanation pressure was marked on the ordinate and the electronic Schiotz reading on 5.5 gm. line of the nomogram. These readings were joined by a straight line. Another line, parallel to the above line, was drawn passing through the intercept of the ordinate and the absissa. The point of inter­section of this line and the pro­tractor, which is graduated for the co-efficient of ocular rigidity, gave the ocular rigidity for the eye.

The ocular rigidity of both eyes was determined, a couple of days before and 6 to 12 weeks after the cataract operation.


  Results Top


In 33 cases, the pre-operative average ocular rigidity was 0.0241, which varied from 0.011 to 0.035. While its post-operative average value was 0.0239 varying from 0.013 to 0.041. It decreased in 19 (57.5%), increased in 10 (30.3%) and remained unchanged in 4 (12.2 %) cases.

In the unoperated eyes, which served as the control, the average ocular rigidity prior to the ope­ration was 0.023 while it was 0.225 after the operation in other eye. Pre-operative ocular rigidity vari­ed from 0.016 to 0.037, while post-operatively it ranged from 0.017 to 0.029. Within the group, the post-operative ocular rigidity was increased in 12 cases (36.4%) unchanged in 4 (12.2%) and de­creased in the remaining 17 (51.4 %) cases.


  Comments Top


Dreager reported a decearse in the ocular rigidity after intra-ocu­lar surgery, due to its effect on the ocular coats. Miller et al [3] on the contrary, concluded that the ocular rigidity was not signifi­cantly altered by the cataract surgery. His observations were also I coroborated by Yunossada [4] the present study, the range of variation in ocular rigidity was very nearly the same in operated and unoperated eyes.

Statistical analysis, by the ap­plication of T test shows that the calculated T value in operated eye (0.715) and unoperated fellow eye (0.74) is lesser than the tabu­lated T value (1.96) at 5% of signi­ficance of 32° of freedom. We conclude on the basis of statisti­cal analysis that ocular rigidity is not significantly affected by un­complicated cataract extraction.

Thus our observations are in complete agreement with those of Miller et al [3] and Yunossada [4]


  Summary and Conclusion Top


Pre- and post-operative study on ocular rigidity in 33 cases of cataract, did not show any signi­ficant change after cataract ex­traction.

 
  References Top

1.
DREAGER J.: Docum. Ophtha'. Den Haag, 13, 431 (1959), cited in 2 p. 38.  Back to cited text no. 1
    
2.
GLOSTER J.: Tonometry and tono­graphy (1st edition). J and A Churchill Ltd. London (1966).  Back to cited text no. 2
    
3.
MILLER J. E., KESKY G. R. and BECKER B.: Cataract extraction and aqueous outflow. A.M.A. Arch. Ophthal. Chicago. 58, 401-406 (1957).  Back to cited text no. 3
    
4.
YUNOSSADA M. K.: Klin. Mon. Augenheilk, 141, 846-852 (1962), taken from Amer. J. Ophathal. 55, 1293 (1963).  Back to cited text no. 4
    



 
 
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