We have located links that may give you full text access.
Association between total astigmatism and myopia.
Journal of Cataract and Refractive Surgery 1997 December
PURPOSE: To determine whether there is an association between degree of myopia and total astigmatism.
SETTING: St. Paul's Eye Unit, Royal Liverpool University Hospitals, Liverpool, United Kingdom.
METHODS: Refractive and keratometric data for 105 eyes of 105 patients with myopia and astigmatism who attended a photorefractive keratectomy (PRK) assessment clinic were analyzed. The refractive data of the patients having PRK were also analyzed before and after treatment.
RESULTS: There was a strong correlation between total astigmatism (A) and degree of myopia. This could be represented by a linear regression line in the form A = -0.13 x myopia + 0.86 (at the corneal plane). Although there were trends, there was no significant correlation between the degree of corneal (keratometric) astigmatism and myopia. Data of 35 patients who had PRK were analyzed to determine whether the observed effect on astigmatism could have been predicted from the relationship between myopia and astigmatism. Forty-nine percent of patients with myopia and astigmatism were overcorrected by 0.6 diopter (D) (0.2 to 2.0 D), resulting in a preoperative to postoperative axis shift of 73 degrees; 40% were undercorrected by 1.2 D (0.5 to 3.1 D). Both over- and undercorrections could have been predicted from the relationship between myopia and astigmatism.
CONCLUSIONS: The total amount of astigmatism in the myopic eye is proportional to the degree of myopia. The amount that one intends to treat should, therefore, be modified according to the amount of myopia to be treated, as determined by the relationship between the degree of astigmatism and myopia.
SETTING: St. Paul's Eye Unit, Royal Liverpool University Hospitals, Liverpool, United Kingdom.
METHODS: Refractive and keratometric data for 105 eyes of 105 patients with myopia and astigmatism who attended a photorefractive keratectomy (PRK) assessment clinic were analyzed. The refractive data of the patients having PRK were also analyzed before and after treatment.
RESULTS: There was a strong correlation between total astigmatism (A) and degree of myopia. This could be represented by a linear regression line in the form A = -0.13 x myopia + 0.86 (at the corneal plane). Although there were trends, there was no significant correlation between the degree of corneal (keratometric) astigmatism and myopia. Data of 35 patients who had PRK were analyzed to determine whether the observed effect on astigmatism could have been predicted from the relationship between myopia and astigmatism. Forty-nine percent of patients with myopia and astigmatism were overcorrected by 0.6 diopter (D) (0.2 to 2.0 D), resulting in a preoperative to postoperative axis shift of 73 degrees; 40% were undercorrected by 1.2 D (0.5 to 3.1 D). Both over- and undercorrections could have been predicted from the relationship between myopia and astigmatism.
CONCLUSIONS: The total amount of astigmatism in the myopic eye is proportional to the degree of myopia. The amount that one intends to treat should, therefore, be modified according to the amount of myopia to be treated, as determined by the relationship between the degree of astigmatism and myopia.
Full text links
Related Resources
Trending Papers
Challenges in Septic Shock: From New Hemodynamics to Blood Purification Therapies.Journal of Personalized Medicine 2024 Februrary 4
Molecular Targets of Novel Therapeutics for Diabetic Kidney Disease: A New Era of Nephroprotection.International Journal of Molecular Sciences 2024 April 4
The 'Ten Commandments' for the 2023 European Society of Cardiology guidelines for the management of endocarditis.European Heart Journal 2024 April 18
A Guide to the Use of Vasopressors and Inotropes for Patients in Shock.Journal of Intensive Care Medicine 2024 April 14
Diagnosis and Management of Cardiac Sarcoidosis: A Scientific Statement From the American Heart Association.Circulation 2024 April 19
Essential thrombocythaemia: A contemporary approach with new drugs on the horizon.British Journal of Haematology 2024 April 9
Get seemless 1-tap access through your institution/university
For the best experience, use the Read mobile app
All material on this website is protected by copyright, Copyright © 1994-2024 by WebMD LLC.
This website also contains material copyrighted by 3rd parties.
By using this service, you agree to our terms of use and privacy policy.
Your Privacy Choices
You can now claim free CME credits for this literature searchClaim now
Get seemless 1-tap access through your institution/university
For the best experience, use the Read mobile app