Q: How to understand contact lens power?
A: Good topic of "how to understand contact lens power", the wrong prescription will make contact lenses cause itching and vision does not clear .For the contact box, browse the prescription information from left to right. The prescription should unfold in the following way: Eye, Power (sphere), BC, Dia and Brand. The attention column will contain either OD, OS or OU, which mean right eye, left eye or both eyes, respectively. This notifys you what eye the prescription is made for.
Look into the next column, that is the effectiveness of the contact for the eye. Power is measured from 20.00 to +20.00 (in dioptres), and also this equates to the number of compensation required by the attention. It basically reflects the extent from the nearsightedness/myopic (a bad number) or farsightedness/hyperopic (a good number).
Read the following chart to comprehend what your power or sphere means (obtained from mdsupport.org):
20/20____Plano to -0.25
20/50____-1.00 to -1.25
20/100___-1.75 to -2.00
20/200___-2.00 to -2.50
Development of the child most often used powers. In case your power was a student in the positives (meaning you happen to be farsighted), then this snellen chart ratio would grow larger compared to smaller.
Learn the Snellen chart means. When having an eye test, one eye is included at a time, plus the vision is recorded. Inside the Snellen ratio of 20/20 (what we've categorized as normal eyesight), the first 20 is the distance in the test-20 feet. The 2nd 20 is the distance a standard eye could see with the test-20 feet. Thus, 20/20 is "normal" eyesight. If, for instance, your ratio is 20/40, in that case your eye sees the exam at 20 feet, in which a normal eye could see it at 40 feet, etc down their email list. Therefore, the effectiveness of your lens essentially notifys you the compensation required for the eyes to be able to see at 20/20.
- Model No: EA047
- Highlight: Latest Fashion Style
- Gender: Woman’s Eyewear
- Age Group: Adults
- Frame Size: 55-17-140
- Shape: Rectangle Eyewear
- Spring Hinge: No
- Color: Blurgundy
- Available Color: Purple, Blue
- Material: Acetate
- Tips: No
- Bridge: Unadjustable nose pads
- Original: ShenZhen
- Rim: Full-Rim Spectacle
- Certificate: CE and FDA are certificated
- Warranty:1-Year Warranty.
- Availability: In Stock in Eyewear Manufacturer
- Payment Terms: Paypal, Western Union
- Minimum Order:12pcs/Model, 300pcs in total
- Market Preference: European Eyewear, Africa Spectacle Frame
- Eyewear Quote
- Package: 1pcs/Poly-bag, 12pcs/Inner Box, 300PCS/Carton
- Carton Box Size: 84*27*31
- Cross Weight: 12KGS
- HS Code: 90031900
- Delivery Time: Within 7 days upon received your payment