Pengenalan Produk
Classic Precision: The Engineering of Flat-Top Bifocal Geometry
Flat-top bifocals, often referred to as D-Seg lenses due to the "D" shaped near-vision segment, remain one of the most reliable solutions for presbyopic patients who require distinct, non-overlapping visual zones. The optical architecture of a flat-top lens is designed to provide a wide, stable area for reading while maintaining a clear, expansive upper zone for distance vision. The defining characteristic is the straight horizontal line at the top of the segment, which is strategically positioned to minimize the "image jump" effect—a common phenomenon in older bifocal designs where objects seem to shift position as the eye moves across the segment boundary. Our D-Seg lenses are produced using high-precision liquid casting technology, ensuring that the transition between the distance carrier and the reading add is structurally seamless and optically stable. Available in various segment widths, most notably the 28mm standard, these lenses offer an optimized field of view that caters to the natural scanning motion of the human eye. By utilizing high-purity resins, we ensure that the chromatic aberration within the reading segment is kept to an absolute minimum, allowing for crisp, high-contrast text rendering. This design is particularly favored by experienced bifocal wearers and individuals whose occupations involve frequent switching between distant objects and close-up documents, providing a level of categorical clarity that progressive lenses sometimes lack.
| Segment Type | D-Segment (Flat Top) |
| Standard Width | 28mm / 35mm |
| Available Indices | 1.499, 1.56, 1.61 |
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 Presbyopia Correction
- Intensive Reading Tasks
- Static Workspace Environments
- Wide and Stable Reading Area
- Minimized Image Jump Effect
- High Adaptation Success Rate
-
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: Why is it called a "D-Seg" lens?
- A: Because the reading segment is shaped like a capital letter "D" turned on its side.
- Q: How does the flat top help with reading?
- A: It provides a wide horizontal field of view right at the top of the reading zone.
- Q: Is there a visible line on the lens?
- A: Yes, the flat-top design has a distinct, visible segment line.
- Q: Can these be made in high-index materials?
- A: Yes, they are available in 1.56 and 1.61 for thinner edges.
- Q: Are they suitable for driving?
- A: Yes, the upper portion is dedicated entirely to clear distance vision.
- Q: What segment widths are available?
- A: The 28mm is standard, but 35mm is available for wider reading needs.
- Q: Do they come with anti-reflective coating?
- A: Absolutely, SHMC is recommended to reduce reflections on the segment line.
- Q: Are they better than progressive lenses?
- A: For users who want a wider, fixed reading zone, they are often preferred.
- Q: Can they be tinted for sunglasses?
- A: Yes, the resin material tints uniformly across both zones.
- Q: How do I measure the segment height?
- A: Usually from the lower eyelid or the bottom of the frame.
T/T, PayPal, Western Union. 7-10 Days Lead Time.
MOQ: 100 Pairs. ISO 9001 Standards.
