OSTEN / BIFOCAL SERIES

Bifocal
Series Lenses

CLEAR VISION.
TWO DISTANCES.

Bifocal lenses combine distance and near vision correction in one practical lens, helping you see clearly across the moments that matter every day.

D-Seg

Round-Seg

Invisible Seg

One Lens.
More Possibilities.

DISTANCE TODAY. A CLEARER TOMORROW.

WHAT ARE BIFOCAL LENSES?

Two vision zones.
One lens.

Bifocal lenses are designed with two distinct optical powers in the same lens. The upper portion provides clear distance vision, while the lower segment provides additional power for near vision such as reading and close-up activities.

DISTANCE VISION

See clearly at a distance.

NEAR VISION

Read and focus with ease.

TWO DISTINCT ZONES

Distance and near
vision in one lens.

A PROVEN SOLUTION

A trusted choice
for everyday vision.

TWO DESIGNS / ONE PURPOSE

Choose your
vision style.

OSTEN Bifocal lenses are available in distinct segment designs, each combining distance and near vision in one lens.

D-SEG / FLAT TOP

Flat top.
Wide near vision.

The D-Seg, also known as Flat-Top, uses a D-shaped near-vision segment with a straight upper edge. It provides a practical and clearly defined area for reading and close-up activities.

01 Wide reading area

02 Easy to locate

03 Familiar design

04 Everyday practicality

ROUND-SEG / ROUND TOP

Round top.
Discreet appearance.

The Round-Seg uses a circular near-vision segment. Its rounded design creates a compact near-vision area while maintaining the practical two-zone structure of a traditional bifocal lens.

01 Classic design

02 Compact near zone

03 Distinctive appearance

04 Everyday practicality

INVISIBLE BIFOCAL / BLENDED

Clean look.
Discreet bifocal.

Invisible bifocal lenses provide both distance and near vision correction while keeping the near-vision area much less noticeable than a traditional lined bifocal.

01 Virtually invisible line

02 Distance + near vision

03 Cleaner appearance

04 Dedicated reading area

THREE BIFOCAL DESIGNS

Three designs.
Different character.

Both designs provide two distinct vision zones — distance and near. The difference lies in the shape, size and visual character of the near-vision segment.

FEATURE

D-Seg

Round-Seg

Invisible Bifocal

Segment Shape

— D-shaped with a flat upper edge

— Circular near-vision segment

— Blended round near-vision segment

Near Vision Area

✓ Wide and easy to locate

✓ More compact near zone

✓ Dedicated near-vision area

Appearance

Distinct horizontal segment line

More discreet rounded appearance

Virtually invisible segment line

Reading & Close Work

✓ Strong everyday practicality

✓ Suitable for focused close work

✓ Suitable for reading and close work

Design Character

Practical & familiar

Classic & discreet

Clean & virtually line-free

Best For

Users wanting a generous, clearly defined reading area

Users preferring a more compact, subtle segment

Users wanting a less noticeable bifocal appearance

Traditional bifocals provide distance and near vision in two distinct zones. They do not provide the dedicated intermediate zone found in trifocal or progressive lenses.

D-SEG / FLAT TOP

For a wider reading experience.

The flat-top design offers a clearly defined near area that is easy to locate, making it a practical choice for reading and everyday close-up activities.

ROUND-SEG

For a more discreet look.

The rounded segment creates a compact near-vision area with a classic, less prominent appearance while retaining the traditional two-zone design.

INVISIBLE BIFOCAL / BLENDED

For a virtually line-free appearance.

The near segment is blended into the distance portion so the dividing line is much less noticeable, while retaining separate distance and near vision.

BIFOCAL LENSES / FAQ

Questions,
clearly answered.

Everything you need to know about bifocal lenses, their two vision zones, and the difference between D-Seg and Round-Seg designs.

Bifocal lenses contain two distinct optical powers in one lens. The upper portion is designed for distance vision, while the lower segment provides the additional power needed for near vision.

A D-Seg, also called Flat-Top or Straight-Top, uses a D-shaped near-vision segment with a flat upper edge. It provides a clearly defined and relatively wide area for reading and close-up activities.

A Round-Seg bifocal uses a circular near-vision segment. Its rounded shape can make the separating line less noticeable than the upper line of a D-Seg design, while maintaining the traditional two-zone bifocal structure.

Neither design is universally better. The right choice depends on your prescription, visual habits, frame, preferred appearance, and how you use your near-vision area. An optical professional can help determine which design is more suitable for you.

Traditional bifocals primarily provide distance and near vision. They do not have a dedicated intermediate zone like trifocal or progressive lenses. This can be important for tasks such as computer work or viewing objects at arm's length.

Traditional bifocals have a visible line separating the distance and near zones. The appearance of that line varies by design. Round-Seg designs can make the boundary less noticeable than a D-Seg design.

Your eyes and brain may need some time to become familiar with the two distinct viewing zones. Your optician can ensure the lenses are correctly fitted and positioned for your individual needs.

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Yes. The lower portion of a bifocal is specifically designed to provide the additional optical power required for near tasks such as reading, viewing a phone, writing and other close-up work.

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OSTEN BIFOCAL SERIES

Bifocal
Series Lenses