What are semi-finished lenses?

Semi-finished lenses are lenses that have been partially processed and require additional work to transform them into the final product. These lenses usually come in a blank state, and manufacturers reshape them according to the patient's prescription. Semi-finished lenses are usually available in a variety of materials including plastic, glass and polycarbonate.

Semi-finished lenses have refractive powers that help improve vision. They are designed to correct specific vision problems such as myopia (nearsightedness), hyperopia (longsightedness), astigmatism, and presbyopia. Depending on the prescription, the manufacturer will machine the lenses into the desired shape and size to correct vision problems.

Advantages of semi-finished lenses

1. High cost performance - semi-finished lenses are more affordable than finished lenses. This is because they require minimal labor and equipment to manufacture, reducing production costs. This means patients can enjoy high-quality glasses at a lower cost.

2. Customization - semi-finished lenses can be customized to fit specific prescriptions and lens shapes. Manufacturers can tailor these lenses to a patient's prescription, resulting in more precise and accurate glasses.

3. Versatility - semi-finished lenses are versatile and can be used to create a wide range of eyewear products. These lenses are ideal for sunglasses, eyeglasses, and other optical products that require precision lenses to improve vision.

4. Efficiency - Semi-finished lenses are processed with advanced technology and equipment, which are more efficient than traditional lenses. They are designed to provide better visual quality and reduce the time it takes to produce glasses.

How semi-finished lenses are made

Semi-finished lenses are produced using advanced manufacturing techniques to ensure precision and accuracy. The manufacturing process involves several steps, including:

1. Casting - The manufacturer pours the lens material into a mold to create a blank lens.

2. Cutting - The blank lens is then cut to specific dimensions using an advanced cutting machine. The manufacturer blocks the lens to provide a stable platform for further processing.

3. Generator - The blocking process usually oversizes the lens slightly. So manufacturers use generators to grind lenses into the precise shape needed for a particular prescription.

4. Polisher - The manufacturer polishes the lens to remove any rough edges, ensuring a smoother surface for better vision.

5. Surface Coating – Manufacturers apply a coating to the lens to provide additional protection from scratches, glare, and UV rays.

We hope we have given a comprehensive overview of semi-finished lenses and their importance in the optical industry. If you have any questions or concerns about our products, please feel free to contact us. We'd be happy to provide you with more information or assistance.