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A Comparison of Refractive Status Findings Collected with the Nikon Retinomax2® Autorefractor Before and After Use of 1% Tropicamide in Children

出版	Northeastern State University, 2002
URL	http://books.google.com.hk/books?id=xo-ftAEACAAJ&hl=&source=gbs_api

註釋Purpose: This study compared the use of the hand held Nikon Retinomax2® autorefractor before and after cycloplegia obtained with 1% tropicamide and 2.5% phenylephrine in children ages 5 to10 years. The autorefractor results were compared to results of the subjective refraction which yielded the subject's best corrected visual acuity (#7A). Methods: Thirty-five children (22 girls, 13 boys), with a mean age of 7.9 years, received comprehensive vision examinations. The refractive status of both eyes of each subject was evaluated with the Nikon Retinomax2® autorefractor before the examination began and again 30 minutes (±10minutes) after the child had been cyclopledged. These readings were compared with results from the #7A testing. Results were converted from conventional minus cylinder notation to vectors using the Thibos method and compared in graph form. Results: The mean difference between the pre-cycloplegic Retinomax2® and the #7A for right eyes was -0.58-0.05x163 and the mean vector was 0.80 (p=0.03). The difference for left eyes was -0.23-0.11 x100 and the mean vector was 0.55(p=O.06). The mean difference between the post cycloplegic Retinomax2® and the #7A for right eyes was +0.58-0.13x005 and the mean vector was 0.65 (p=0.0001). The difference for left eyes was +O.52-0.06x108 and the mean vector was 0.73 (p=0.01). The mean vector was greatest for subjects 5-6 years old. The vector magnitude increased as the Retinomax2® spherical equivalent increased. The average of pre and post Retinomax2® readings minus the #7A was 0.00-0.08x179 for the right eyes and +O.15-0.08x102 for the left eyes. Conclusions: The Nikon Retinomax2® readings correlate closely with a patient's #7A and can be used as a method to estimate the refractive status in children. Whenever possible, a combination of the pre and post cycloplegia Retinomax2® readings and the best corrected visual acuity results should be used to decide on a final corrective prescription for best results.