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


Title: Accuracy and Repeatability of the Refractive Error Measurements by Photorefractometer
Author(s): Zhale Rajavi, Hamideh Sabbaghi, Ahmad Shojaei Baghini, Mehdi Yaseri, Koroush Sheibani
Presentation Type: Oral
Subject: Strabismus & Neuro-ophthalmology
Others:
Presenting Author:
Name: Zhale Rajavi
Affiliation :(optional) Ophthalmic Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
E mail: zh_ra2000@yahoo.com
Phone: 22170799
Mobile: 09123306590
Purpose:

To determine the accuracy of photorefraction and autorefraction compared to cycloautorefraction as the gold standard and to detect the repeatability of photorefraction.

Methods:

This diagnostic study included 86 right eyes of children aged 7 to 12 years. Refraction was performed using photorefraction and autorefraction with and without cycloplegia. Photorefraction for each eye was performed three times to test the repeatability.

Results:

Photorefractometer had acceptable sensitivity and specificity in measurement of myopia and astigmatism. There were not any significant differences considering myopia and astigmatism in all comparisons, while difference was significant for hyperopia in both amblyogenic (p=0.006) and nonamblyogenic criteria (p=0.001). Using cut points of +1.12D and +2.6D instead of +2.00D and +3.50D could improve sensitivity of photorefractometer from 65.38% to 84.62% and from 46.15% to 69.23%, respectively. The photorefraction repeatability in measurement of myopia, astigmatism and hyperopia was acceptable (ICC: 0.98, 0.94 and 0.77, respectively). Autorefraction was different when compared to cycloautorefraction in hyperopia (P<0.0001), while showed similar results in myopia and astigmatism.

Conclusion:

Although photorefraction was reliable for hyperopia, myopia and astigmatism measurements, its sensitivity was low only for hyperopia which could be improved by considering cut points. There was not any significant difference between photo and autorefraction compared to cycloautorefraction.

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  - بـیــست و چهارمین کنــگــره سـالیـانه انـجـمـن چـشـم پـزشـکی ایـــران