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KMID : 1011420200250040379
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Journal of Korean Ophthalmic Optics Society
2020 Volume.25 No. 4 p.379 ~ p.393
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Methods of Determining Near Addition in Presbyopia Using the Accommodative Response
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Kim Sung-Jin
Kim Ki-Hong
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Abstract
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Purpose: The purpose of this study was to determine addition in presbyopia using the critical points in the range of the accommodative response (AR), which affects addition in the monocular.
Methods: In order to determine the relationship between the AR and addition in the monocular, 190 patients (35.19±1.43 years, male 72 and female 58) with myopia and 60 patients (61.73±1.13 years, male 32 and female 28) with hyperopia were examined. The values of the AR points of the intraocular lens were obtained using a retinoscope instrument, with a 0.4 MEM Snellen single E card (BC11981 bernell) attached in front of the retinoscopes head (no 18235, Welchallyn, USA).
Results: The ARf in the myopia model had a positive (+) mediating effect between the ARn and AMP, and a negative (?) mediating effect between ARn and addition. ARn had a positive (+) direct effect on AMP, and addition but ARf did not. However, in the hyperopia model with the full corrective refractive powers (ARf?0.00 D), the accommodation factors had a significant effect on each other in the positive (+) direction.
Conclusions: If the critical point on the ARn corresponds to extraocular stimulus of the near point is the C·P=1?ARf (myopia: ?1.00≤ARf≤0.00 D, ±1.00≤AMP≤±3.00 D), the clinical equation of near addition in presbyopia is given by addition =ARn?C·P.
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KEYWORD
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Accommodative response, Addition, Presbyopia, Myopia, Hyperopia
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