Accuracy of Lenes Power and Optical Center Distance of Ready-Made Presbyopic Spectacles Cost Less Than 100 Baht
Keywords:
ready-made presbyopic spectacles, lenes power, optical centerAbstract
Objective: This was to study the accuracy of lenes power and the symmetry of the optical center of the both lenes of ready-made presbyopia spectacles priced below 100 baht .
Methods: Ready-made presbyopia spectacles which had the power of lenes in the range +0.5 to +3.5 diopter and priced below 100 baht were purchased. The spectacles were evaluated the accuracy of the lenes power compared to the tags and measured the distance optical center of lenes.
Results: The mean price of 140 spectacle was 75.66 ± 13.9 baht. The average of both lenes power (right and left) of 109 spectacles (77.9%) equaled to the tags of lenes power and 31 spectacles (22.1%) were not equal to the tags. There was not difference between both groups (p = 0.157). Horizontal axis, the mean distance from the optical center to the mid-bridge of spectacles of the right lenes was 33.87 ± 2.09 mm and of the left lenes was 34.07 ± 2.22 mm with no statistical difference (p = .214).The mean distance between the optical center was 68.12 ±3.75 mm. Vertical axis, the distances between the optical center and lower edges of lenes between right and left were different with statistical significance (p = .022).
Conclusion: The power lenes tags of Ready-made presbyopia spectacles priced below 100 baht are reliable. The optical center of spectacles in horizontal axes is symmetrical on the right and left sides but there is no symmetry on the vertical axis.
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ลิขสิทธิ์บทความเป็นของผู้เขียนบทความ แต่หากผลงานของท่านได้รับการพิจารณาตีพิมพ์ลงวารสารแพทย์เขต 4-5 จะคงไว้ซึ่งสิทธิ์ในการตีพิมพ์ครั้งแรกด้วยเหตุที่บทความจะปรากฎในวารสารที่เข้าถึงได้ จึงอนุญาตให้นำบทความในวารสารไปใช้ประโยชน์ได้ในเชิงวิชาการโดยจำเป็นต้องมีการอ้างอิงถึงชื่อวารสารอย่างถูกต้อง แต่ไม่อนุญาตให้นำไปใช้ในเชิงพาณิชย์
