Change of Anterior Corneal Astigmatism and Posterior Corneal Astigmatism With Aging and After Cataract Surgery
Narrative Responses:
Purpose
To evaluate the distribution and change of anterior and posterior corneal astigmatism with aging and after cataract surgery.
Methods
Anterior and posterior corneal astigmatism was measured with the Pentacam system and the changes with age and after cataract surgery were analyzed. Vector analysis was used to assess the change of astigmatism after cataract surgery.
Results
The study analyzed 420 eyes of 269 patients for the change of corneal astigmatism with aging, 80 eyes of 72 patients for anterior corneal astigmatism and 39 eyes of 34 patients for posterior corneal astigmatism. 65.23% of eyes displayed with-the-rule astigmatisms for the anterior cornea surface and there was a trend to decrease the proportion of with-the-rule astigmatisms with age. For the posterior cornea surface, 90.95% of eyes displayed against-the-rule astigmatisms and did not change with age. After cataract surgery, the change of mean astigmatism was greater in anterior cornea surface (pre: 0.94±0.70D @79, post: 0.77±0.66D @65) than in posterior cornea surface (pre: 0.41±0.16D @86, post: 0.40±0.25D @86).
Conclusion
With increasing age, the posterior corneal astigmatism is additive to anterior corneal astigmatism. After cataract surgery, anterior corneal astigmatism was greater change than posterior corneal astigmatism.