LY-23N Near vision acuity chart
Product Name:
LY-23N Near vision acuity chartModel No.:
LY-23NMinimum Order:
1
Product Abstract:
Horizontal style,for testing at 30cm.
- Product Description
- Specifications:1. It's one-sided.2. It's horizontal.There is also vertical style.Please see link:http://www.jhoptical.com/LY-23NS.html3.Test distance is 30cm .Led illuminated near vision acuity. It's for weak sight,hyperopia and presbyopia testing.4. Packing: 29cm x 20cm x 6cm, 0.55kgFeatures:1.Using high-tech light-emitting,power saving,slim and accuracy testing.2.High brightness and uniform light-emitting make every chart be with consistent brightness contrast.It ensuresaccuracy testing.3.LED photoelectric conversion efficiency is more than 80%.the same brightness of the light just around 10%of the electricity needed to traditional fluorescent lamp.4.Protect eyesight: DC drive, no flash(Normal lights are AC drive, it will inevitably produce strobe).5.Health: Healthy light contain ultraviolet and infrared light, no radiation(ordinary light contains ultraviolet and infrared).6.Green: no mercury,xenon or other harmful elements, and will not produce electromagnetic interference(ordinary lamp contains mercury and lead elements, electronic ballasts will produce electromagnetic interference).7.Long life: life of up to 100,000 hours.8.Safety factor: safety voltage, current, and smaller, less heat, no security risk.
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Contact Us
Contact:
Mr. Li YiyangTel:
+86 15001978117Fax:
+86-21-50301363E-mail:
jiahe@jhoptical.com-
