What type of lenses should children's glasses have?

All children's glasses should have polycarbonate or Trivex lenses. These materials provide the impact resistance necessary to protect children's eyes during play, sports, and everyday activities. Standard plastic (CR-39) and glass lenses are not appropriate for children because they do not offer adequate impact protection.

What are cable temples on children's glasses?

Cable temples are temple arms that curl around the back of the ear, similar to a hook, instead of resting straight along the side of the head. They keep glasses more securely on the child's face during running, playing, and other active movements. Cable temples are especially recommended for toddlers, preschool-age children, and very active kids.

How often should children's glasses be replaced?

Children's glasses should be evaluated for replacement every 12 to 18 months due to facial growth, even if the prescription has not changed. A frame that fit properly a year ago may now be too small, causing the optical centers to misalign with the child's pupils. Regular check-ups help ensure the glasses continue to fit and function correctly.

How do I get my child to wear their glasses?

Let the child participate in choosing their frames from a set of approved options, select colors and styles they find appealing, and ensure the fit is comfortable from day one. Consistent wear habits are easier to establish early. For very young children, gradual introduction with positive reinforcement works well. If the child resists, have the fit rechecked since discomfort is a common reason for refusal.

Children's Eyewear Selection: Safety, Fit, and Material Guidelines

Why Children's Eyewear Requires Special Consideration

Dispensing eyewear for children is fundamentally different from fitting adults. Children are more active, less careful with their belongings, and still developing visually. The wrong frame or lens choice can lead to non-compliance (the child refuses to wear their glasses), breakage, or even injury. Safety is the absolute priority, followed by proper fit and comfort.

Lens Material: Polycarbonate or Trivex Only

For all children, polycarbonate or Trivex lenses are mandatory. There is no acceptable alternative. These materials provide the impact resistance necessary to protect developing eyes during the inevitable bumps, falls, and sports activities of childhood.

Polycarbonate: Extremely impact-resistant, lightweight, built-in UV protection, thinner than standard plastic. The default choice for most pediatric prescriptions.
Trivex: Slightly lighter than polycarbonate, better optical clarity (higher Abbe value), excellent impact resistance. Preferred for higher prescriptions where optical quality matters.

Dispensing CR-39 or glass lenses to a child because of a parental preference for "better optics" or lower cost. Standard plastic and glass lenses do not provide adequate impact protection for children. This is a safety issue, not a preference issue. Always explain why impact-resistant materials are non-negotiable.

Frame Material Selection

Children's frames should prioritize durability and flexibility. The best frame materials for children include:

Nylon/TR-90 (Grilamid): Extremely flexible, lightweight, and impact-resistant. These frames can bend significantly without breaking, ideal for rough handling.
Rubber/silicone frames: For infants and toddlers, soft rubber or silicone frames provide maximum safety with no hard edges or breakable components.
Beta-titanium: For older children who want a more mature look, beta-titanium provides flexibility and hypoallergenic properties.

Avoid rigid materials like standard acetate for very young or very active children, as they are more likely to break on impact.

Frame Features for Children

Spring Hinges

Spring hinges are strongly recommended for children's frames. They allow the temples to flex outward beyond normal, absorbing stress from rough handling. Children frequently open their glasses with one hand, sit on them, and pull them off roughly. Spring hinges withstand these forces without the frame going out of alignment.

Cable Temples

Cable temples wrap around the back of the ear, keeping glasses securely in place during physical activity. They are especially important for:

Toddlers and preschool-age children who cannot yet self-manage their glasses
Active children in sports or playground activities
Children with amblyopia who must wear their glasses consistently for treatment to work

For toddlers and infants, consider frames with a head strap or band instead of traditional temples. These keep the glasses securely on the child's face during crawling, rolling, and other active exploration. Cable temples alone may not provide enough retention for the youngest patients.

Integrated Bridge Design

For young children with undeveloped nasal bridges, look for frames with a low, wide saddle bridge or a strap bridge that sits comfortably without sliding. Many children's frames are specifically designed with a flatter bridge contour. Adjustable nose pads are generally not recommended for young children because the pad arms can bend out of position with rough handling.

Proper Sizing

Correct frame size is critical for both comfort and optical performance. Guidelines for children's frame fitting:

Measurement	Guideline
Eye size	Should closely match the child's eye opening; avoid oversized fashion frames
Bridge width	Must match the child's nasal bridge without sliding down
Temple length	Temple bend should fall at or just behind the top of the ear
Vertical depth	Deep enough for the full Rx but not resting on the cheeks
Horizontal width	Should not extend beyond the width of the child's face

Children's faces grow rapidly. Plan for replacement every 12 to 18 months due to outgrowth, not just lens power changes. Parents should be counseled upfront about the expected replacement timeline so they can plan accordingly.

Special Considerations by Age

Infants and Toddlers (0-3 years)

Flexible rubber or silicone frames with wrap-around head strap
Polycarbonate or Trivex lenses
No small removable parts (choking hazard)
Frequently checked for fit as the face grows quickly

Preschool and Early Elementary (3-7 years)

Nylon or TR-90 frames with spring hinges and cable temples
Bright colors and character designs to encourage wearing
Polycarbonate or Trivex lenses
Consider backup pair for school

Older Children and Teens (8+ years)

Broader material options including metal and acetate
Spring hinges still recommended
Style becomes more important for compliance
Sports-specific eyewear for athletes (ASTM F803)
Polycarbonate or Trivex remains the standard

Encouraging Compliance

The best glasses in the world are useless if the child refuses to wear them. Strategies for encouraging compliance:

Let the child participate in frame selection (offer 2-3 pre-approved options)
Choose colors and designs the child finds appealing
Ensure the fit is comfortable from the first wearing
Educate parents about the importance of consistent wear, especially for amblyopia treatment
Schedule follow-up adjustments, as a poor fit leads to non-wear

Clinical Relevance

Pediatric dispensing carries additional responsibility because vision development depends on consistent, clear visual input during childhood. Under-corrected or poorly fitting glasses can impair visual development, especially in cases of amblyopia or strabismus. The dispensing optician plays a direct role in a child's visual outcome by ensuring the eyewear is safe, comfortable, and consistently worn.

Key Takeaways

Polycarbonate or Trivex lenses are mandatory for all children without exception
Flexible frame materials (nylon, TR-90, rubber) are preferred for durability
Spring hinges withstand rough handling and reduce breakage
Cable temples keep glasses secure during active play
Proper sizing prevents the frame from sliding, resting on cheeks, or extending past the face
Children's frames should be replaced every 12 to 18 months as the face grows
Style choices that appeal to the child improve compliance