LY-23NS Near vision acuity chart

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Product Abstract:

Vertical style,For testing at 30cm.

Product Description: Specifications

1.It's one-sided.

2.It's vertical.There is also horizontal style.Please see below link:

http://www.jhoptical.com/LY-23N.html

3.Test distance is 30cm .Led illuminated near vision acuity. It's for weak sight,hyperopia and presbyopia testing.

Features:

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 ensures

accuracy 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.

Packaging Detail: 29cm x 20cm x 6cm, 0.55kg