Materials glossary / Lens material
Reader (plus) lens
On the label: Reading lens · Lens material
What it is
A single-vision magnifying lens in strengths from +0.75 to +4.00 diopters; the same in both eyes on off-the-shelf readers.
Lens materials: What a lens is made of decides its weight, clarity, impact resistance and how it takes a coating; UV blocking is a property of the material and its additives, not the tint.
In the research
3 PubMed papers mention it with jewelry, allergy, eyewear or UV; the three most recent:
- Prediction of the effective postoperative (intraocular lens) anterior chamber depth · Journal of cataract and refractive surgery, 2006
- Reading with a head-mounted video magnifier · Optometry and vision science : official publication of the American Academy of O, 1999
- A comparative evaluation of Readables to single vision lenses · Journal of the American Optometric Association, 1991
A paper is a paper, not a verdict: titles are listed so you can read them, and a study on one fabric or one filter says little about the piece in your hand.
Other lens materials
Clasp & Lens describes materials from the public record and does not appraise, grade or test pieces; what a listing states is the supplier's statement. If a piece causes a rash, take it off; a reaction that spreads or blisters is a doctor's question, and sunglasses are no substitute for impact-rated eye protection where that is required.