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       XXIII Annual Congress of the Iranian Society of Ophthalmology        بـیــست و سومین کنــگــره سـالیـانه انـجـمـن چـشـم پـزشـکی ایـــران
مقاله Abstract


Title: Comparison of Subjective Refraction, Predicted phoropter Refraction (PPR) by Zywave aberrometer, and final surgical plan for laser vision correction
Author(s): Dr. karimian, Dr. Shahabi
Presentation Type: Oral
Subject: Cornea and Anterior Segment
Others:
Presenting Author:
Name: Kameliya Shahabi
Affiliation :(optional)
E mail: cameliamd@yahoo.com
Phone: 02188771036
Mobile: 09123387242
Purpose:

To study the validity and reliability of subjective refraction, Predicted Phoropter Refraction (PPR) measured by Zywave aberrometer, and final surgical plan for application in laser vision correction.

Methods:

48 patients

Results:

The mean difference between “exact” myopia and subjective refraction PPR and corrected myopia in plan were 0.11±0.51D (P=0.03), 0.18± 0.70D (P=0.01), and -0.06±0.46D (P=0.01), respectively. The difference between “exact” myopia and myopia in subjective refraction and PPR was significant, but the difference was not statistically significant (confidence interval 95%) between “exact” myopia and myopia in plan. The mean difference between “exact” astigmatism and astigmatism in subjective refraction, PPR and surgical plan were statistically significant (P<0.05). The largest difference was between “exact” astigmatism and that in PPR. (P-value= 0.021). The correlation coefficient between “exact” myopia and subjective, PPR, and surgical plan myopia were 0.95, 0.92 and 0.96, respectively. Also, the correlation coefficient between “exact” astigmatism, subjective, PPR and astigmatism in plan were 0.89, 0.83 and 0.90 respectively.

Conclusion:

The mean difference between myopia predicted by Zywave aberrometer and subjective refraction is not significant. At present time, planning the myopic refractive correction based on the patient’s subjective refraction and adjusted with age is the most accurate method to achieve least amount of residual refraction.

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  - بـیــست و سومین کنــگــره سـالیـانه انـجـمـن چـشـم پـزشـکی ایـــران