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TLBT Baby Trail Frame
The TLBT Baby Trial Frame is a light, flexible pediatric frame for infants and toddlers that keeps lenses centered during retinoscopy and refraction. It uses a soft elastic strap for secure comfort and accepts standard 38 mm trial lenses, with fixed PD sizes—48 mm (baby) and 54/56 mm (toddler)—for quick, reliable fitting.
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Product description
- The TLBT Baby Trial Frame is a lightweight, flexible pediatric frame designed to keep lenses centered on infants and toddlers during retinoscopy and refraction. A soft elastic head-strap stabilizes the frame even with natural head movement, while fixed pediatric PD options (48 mm baby; 54 mm & 56 mm toddler) make fitting fast and repeatable. Each eye accepts standard 38 mm trial lenses (up to two per eye) so you can stack sphere/cylinder or use an occluder/fogging lens without juggling handheld lenses—handy for cycloplegic refraction, dynamic/spot retinoscopy, and quick screening.
- Clinic-friendly: Durable, easy to disinfect between patients; reduces chair time by freeing both hands for testing
| Topic | Discription |
| Purpose / Target Users | A baby trial frame is used in paediatric vision testing and refraction — to hold trial lenses in front of an infant or toddler’s eyes so the clinician can assess refractive error (myopia/hyperopia/astigmatism), binocular vision, and fixation/attention. Because infants/toddlers cannot reliably sit at a phoropter, this frame provides a hands-on, flexible method of lens testing. Target Users: Ophthalmologists / optometrists specializing in paediatric eye care. Infant/toddler vision screenings (in clinics, hospitals, outreach camps). Orthoptists and vision therapists working with young children. Researchers studying visual development in early childhood. |
| Optotypes / Symbols | The baby trial frame itself does not contain optotypes or symbols — the frame simply holds lenses. For infants/toddlers, the visual acuity/assessment chart will use baby-appropriate targets (e.g., fixation objects, preferential looking tests, lea paddles, grating tests) rather than standard letter charts. So while the frame supports the test, the actual optotypes/symbols are determined by the selected chart/tool used by the clinician. |
| Scaling / Spacing | Scaling / Spacing Interpupillary Distance (PD) / Size Fit: For infants/toddlers, the frame must accommodate very small PDs. For example: A baby trial frame listing supports PD of ~48 mm for “baby size” (e.g., one spec: “baby size supports 48mm PD, toddler sizes 54mm, 56mm”). Jutron Vision Another soft-rubber baby-frame spec: PD ~50 mm for 0-3 yrs. Lens holder capacity: Though for babies the number of lenses needed may be fewer, but many frames support lens cells sized for standard trial lenses (e.g., Ø 38 mm) even in “baby” frames. Example: baby frame spec “three-lens holders suitable for standard Ø 38 mm trial set lenses”. Centro Style Products Spacing and fit adjustments: To ensure correct optical alignment (e.g., centring the lenses in front of the young child’s pupils), good frames will have adjustable nose bridge/temple/strap. For infants you often see elastic strap instead of rigid temple arms (to accommodate head size and movement). For example: “uses a soft elastic strap to provide a comfortable snug fit.” |
| Range of Acuity / Line Sizes | As noted, the trial frame does not itself determine the acuity range or line sizes — this is defined by the visual acuity chart or assessment tool used (which for infants may be preferential‐looking tests, grating tests, etc). What the frame enables: it allows placement of lenses so the clinician can assess different refractive powers and thereby influence acuity outcomes. A high‐quality baby frame supports accurate lens positioning so that acuity testing (even if non‐letter‐based) is valid. |
| Testing Distance | The frame itself is neutral regarding testing distance — whether the test is done at e.g., ~3 m, 6 m or near distance for infants, the frame’s role is to hold the lenses. In infant/toddler testing, often shorter distances or special fixation targets are used. The frame must fit and remain stable at whatever distance the clinician uses. Some baby frames emphasise head movement and comfort (elastic strap) because keeping the child still at e.g., 6 m can be difficult. |
| Physical Size & Portability | PD / size range: Baby size ~48-50 mm PD. Eg: one frame: baby size supports 48 mm PD. Jutron Vision Another: “PD: 50 mm, Weight: 16 g” for a 0-3 yrs frame. Centro Style Products Weight: Many baby frames are extremely lightweight. Example: frame weight 16 g in one baby model. Lens holder diameter: Even baby frames may be built to accept standard Ø 38 mm trial lenses. Eg: “three lens holders suitable for standard Ø 38 mm trial set lenses” Frame dimensions (width/height): One spec: “Baby size measures 98 mm from hinge to hinge” (for flexible baby trial frame). Strap / arms: Some baby models use elastic strap instead of standard temple arms (to fit infants). Eg: “soft elastic strap to provide a comfortable snug fit.” |
| Mounting / Display Features | Mounting / fit: Worn on the infant’s head, typically with elastic strap around the head (especially for babies) or very short, flexible temples. Ensures the frame stays in correct position despite movement. Display / alignment features: Good infant trial frames will have engraved or printed scales for lens axis/orientation and perhaps PD markings (even if PD is fixed). Eg: some children’s frames mention “scale in 5° increments” for axis rotation. The mounting must allow the clinician to adjust lens holders and alignment easily, despite a moving/presenting subject. |
| Features | Material / comfort: For infants, hypoallergenic materials, chew‐safe materials may be relevant (since babies may mouth things). Eg: one spec: “frame without any metal parts… safe in case a child chews it.” Lens holder capacity: Although fewer lenses may be used, some baby frames hold 2 lenses per side (for example: “holds two 38 mm trial lenses on each side” for baby size). Adjustability: Minimal but enough to ensure optical centre alignment: e.g., nose bridge height/angle, strap adjustment, side arm length/angle (for older toddlers). Eg: “flexible sides, adjustable length arms, adjustable angle of side” in pediatric/light-weight model. Safety features: Wrap-around temples or strap to ensure fit, minimal protruding parts, safe for babies. Eg: “wrap-around temples give a good fit to the child’s face”. |
| Included Accessories / Extras | Specific accessories vary by vendor, but good baby trial frames may include: Elastic head strap (for infants). Extra nose pads or soft silicone inserts for comfort/fitting. Protective case or pouch for storage.Cleaning cloth. Possibly colour-coded frames (for kid’s size) or detachable strap for older toddlers. Example from spec: “Each frame comes with: Hard case, Microfibre bag, Adjustable silicone tube.” |
| Durability / Material Qualities | Durability / Material Qualities The material must be durable but lightweight. For infants, materials should be safe (non-toxic, chew safe), hypoallergenic. Eg: “one-piece frame in soft rubber, latex-free and free of metal parts… safe in case a child chews it. Lens cells and mechanical parts must hold trial lenses securely even if the baby moves or the frame is jostled. Good manufacturing tolerances help maintain alignment and prevent loosening. Frequent cleaning/sterilization: baby frames should tolerate cleaning/disinfection protocols.Material quality markers: low weight (e.g., 16 g in one model) indicates lightweight build. Minimal metal parts in baby model reduce risk for infant use. |
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