Semi-finished lenses—also known as bases or blocks in some Latin American countries—are lenses that have been partially processed and are awaiting surfacing by a generator, which will give them positive or negative power as specified in the patient’s optical prescription.
Within the visual industry’s commercialization chain, the semi-finished lens lies on the path between the manufacturer and the optical laboratory.
The quality of the final lens—that is, the one delivered by the optician to the patient—is directly determined by the quality of the base used by the laboratory.
In the optical industry, as in any other industry, there are different quality levels of semi-finished lenses, and there are certain factors that clearly differentiate them:
Price
Although this type of lenses can offer an excellent price–quality ratio, laboratories should be wary of extremely cheap lenses and, above all, avoid at all costs purchasing generic lenses in bulk or by lot.
Temperature resistance
One factor that differentiates the quality of semi-finished lenses is their resistance to heat. A lens that cannot withstand heat will not tolerate laboratory temperatures, especially during the blocking and de-blocking processes.
True Base Curve
A major headache for laboratories is determining whether the base curve stated by the manufacturer on the lens label actually corresponds to the real base curve, which can slow down processes due to the need for additional adjustments.
Accurate parameters for Free-Form
Related to the previous point, other parameters beyond the base curve must also be precise, such as thickness, radius, and sagitta, as these determine whether a semi-finished lens can be successfully processed in a Free-Form laboratory.
Majestic Semi-Finished Lenses, a quality guarantee for your laboratory
With more than 10 years of presence in the Latin American optical market, Majestic lenses have positioned themselves as a quality alternative for independent optical laboratories.
Among the advantages of working with these lenses, we can highlight:
- A world-class product that holds all quality certifications (including ISO 9001)
- Suitable for surfacing on both digital and conventional generators, thanks to the precision of their parameters
- Manufactured using resins from the multinational Mitsui Chemicals
- Lenses registered with and approved by the Food and Drug Administration (FDA)
- A wide range of materials and refractive indices, covering all the clinical and aesthetic needs of patients
Your trusted semi-finished lens supplier
Majestic ophthalmic lenses are exclusively distributed throughout Latin America, the Caribbean, and the USA by Latam Optical. For more information, please send your inquiry along with your laboratory name to info@latamoptical.com.
