Pengenalan Produk
Aesthetic Bifocal Design: The Round-Top Optical Profile
Round-top bifocals, frequently identified as C-Seg lenses, represent a more classic and aesthetically softened approach to multi-focal correction. Unlike the sharp horizontal edge of the flat-top, the round-top segment features a curved upper boundary that blends more naturally into the lower half of the lens. From an engineering perspective, the round segment is cast with a specific focus on peripheral softness, which can be beneficial for certain types of close-up tasks. These lenses were historically the standard for bifocal wearers and continue to be popular for specific vocational uses or for patients who have become accustomed to the "round" visual scanning pattern. The near-vision segment is typically 22mm or 28mm in diameter, providing a concentrated area of magnification that is ideal for reading and detailed handheld work. Our production process utilizes ultra-clean molds to ensure that the boundary of the round segment is crisp and free from optical aberrations. This design is particularly well-suited for smaller frames where a flat-top segment might appear too bulky or intrusive. While progressive lenses have gained market share, the round-top bifocal remains a vital tool for practitioners who need to provide a stable, high-contrast near-vision zone with a classic look and feel. The lens is compatible with all modern coatings, including hydrophobic and blue-light filters, ensuring that traditional design meets modern protection.
| Segment Type | Round-Top (Kryptok Style) |
| Segment Size | 22mm / 24mm / 28mm |
| Material Type | CR-39 / Mid-Index Resin |
Technological Highlights: Premium Monomers and Coating Integrity
- High-Purity Monomer Selection: We exclusively use high-performance monomers (e.g., MR-series) to achieve superior tensile strength and optical purity, resulting in excellent clarity and minimal risk of yellowing over time.
- Precision Liquid Casting Process: The lenses are produced via a controlled liquid casting method that ensures uniform material density and refractive index consistency across the entire blank, which is critical for accurate therapeutic power zones.
- Advanced Vacuum Multi-Coating (SHMC): Coatings are applied in a high-vacuum chamber, using multiple layers of metallic oxides to create a durable, anti-reflective stack. This process guarantees maximum light transmission and minimal glare.
- Thermal Curing Optimization: A slow and precise thermal curing cycle is employed to maximize the material’s resistance to internal stress, ensuring the finished lens remains stable and optically perfect under varying temperature conditions.
- Integrated Peripheral Defocus Geometry: The therapeutic design is engineered into the mold itself for cast lenses, or applied via digital surfacing for semi-finished blanks, guaranteeing the accuracy and consistency of the myopia control zone geometry.
- Traditional Reading Correction
- Detailed Bench Work & Hobbies
- Smaller Frame Aesthetics
- Softer Visual Segment Profile
- Proven Traditional Reliability
- Compatible with Compact Frames
-
0+
Pengalaman Bertahun
-
0㎡
Kawasan Loji
-
0+
Dieksport ke Negara
-
0juta kanta
Kapasiti Tahunan
Penyesuaian
Disesuaikan Untuk Anda
Perniagaan
-
01
Keupayaan Penyesuaian Lengkap
-
02
Seni Bina Kanta Profesional
-
03
Penyesuaian Salutan Fungsian
-
04
Penyesuaian Rx Digital
-
05
Penjenamaan & Pembungkusan
-
06
Penghantaran & Sokongan
- Q: What is the main difference from a flat-top?
- A: The top of the reading segment is curved rather than straight.
- Q: Is the round segment hard to get used to?
- A: For new wearers, it requires a specific scanning habit, but it's very stable.
- Q: Are these lenses heavy?
- A: No, they are made from lightweight resins and are comparable to standard lenses.
- Q: Can they be used in rimless frames?
- A: We recommend 1.61 index round-tops for better rimless durability.
- Q: What is the most common segment size?
- A: The 28mm round segment is currently the most popular choice.
- Q: Do they offer full UV protection?
- A: Yes, 100% UV400 protection is integrated into the material.
- Q: Is there a "jump" when looking down?
- A: There is a slight image jump, characteristic of all lined bifocals.
- Q: Are they available in photochromic?
- A: Yes, we offer round-top lenses in transition grey and brown.
- Q: Can I get them with an anti-fog coating?
- A: Yes, specialized anti-fog treatments can be applied.
- Q: Are these the same as Kryptok lenses?
- A: Kryptok is the traditional glass term; these are the modern resin equivalents.
T/T, PayPal. 8-12 Days Lead Time.
MOQ: 50 Pairs. Precision Quality Control.



















