Ophthalmic Trial Frames
A trial frame is the adjustable spectacle frame an eye care professional uses to build a refraction lens by lens, holding sphere, cylinder, prism, and accessories such as an occluder or pinhole directly in front of the patient's eye. Even in lanes equipped with a phoropter or autorefractor, trial frames stay essential: they let the patient move naturally, look through the correction in real-world posture, and confirm how a prescription will actually feel before it is finalized. That makes them the tool of choice for pediatric exams, low-vision and geriatric patients, over-refraction, home and mobile visits, and any chair where a phoropter is impractical or where you want the patient to "walk around" in the Rx.
US Ophthalmic curates a full range of trial frames, from fully adjustable universal models that fit virtually any patient to lightweight fixed-PD frames, graduated frame sets, and clip-over trial clips for over-refraction. As a US-based equipment provider with an in-house technical and repair department, spare-parts support, and warranty coverage, we help you match the right frame to your exam lane, satellite clinic, or optical lab, and keep it working for years. Whether you are outfitting a single new room or standardizing across multiple sites, our team can help you select trial frames that fit your patient population and your workflow.
How to choose a trial frame
- Universal (adjustable) vs. fixed-PD: A universal frame adjusts PD, temple length, and nose pads to fit any patient, so one frame serves your whole schedule. Fixed-PD frames and graduated sets are lighter and faster to reach for, which suits pediatric, screening, and high-volume settings where a preset PD is fine.
- PD range and precision: Confirm the interpupillary-distance span and per-eye adjustment cover your patient population. Adjustable models typically span roughly 48-80mm with independent left/right settings; clear scale markings make each reading fast and repeatable.
- Lens-cell capacity: Trial frames hold three to five lens cells per side. More cells let you stack sphere, cylinder, and an occluder or pinhole without swapping lenses mid-exam, which speeds subjective refraction and reduces handling errors.
- Weight and material: Lightweight aluminum or titanium frames stay comfortable through longer refractions, low-vision work, and pediatric exams where the patient tires quickly. Lighter frames also sit more stably and drift less on the nose.
- Axis and prism control: Look for smooth 360-degree lens rotation with a clearly graduated degree scale so you can set cylinder axis and prism orientation precisely and reproduce it. Loose or vague axis knobs undermine an otherwise good refraction.
- Fit and stability: Adjustable temple length and angle, pantoscopic tilt, and adjustable nose pads keep the optical centers aligned with the pupils. A frame that seats securely and repeatably is what turns a careful refraction into an accurate final Rx.
Trial frames and sets we carry
Our lineup spans fully adjustable universal frames, economical fixed-PD frames, graduated frame sets, and clip-over trial clips, so you can equip a primary lane and a screening or mobile setup from one source. The comparison below is a categorical guide; ask our team for help matching a model to your patient mix.
| Model | Type | Best for |
|---|---|---|
| TF-70 | Universal, fully adjustable (up to 5 cells per side) | A primary lane that needs one frame to fit every patient, adult to child |
| TF-40 | Fully adjustable universal (wide PD and temple range) | Value all-purpose refraction with maximum fit flexibility |
| TF-35 | Lightweight, economical adjustable (aluminum) | Everyday chair-side refraction where light weight and budget matter |
| TF-20 | Fixed-PD scale frame | Simple, cost-effective fixed-PD checks and dispensing lanes |
| TFK-10 62-70 5pc Set | Graduated fixed-PD frame set (larger PD range) | Clinics that want a preset set spanning common adult PDs |
| TC-10 | Trial clip (clip-over accessory) | Over-refraction and testing over the patient's own spectacles |
Frequently asked questions
When should I use a trial frame instead of a phoropter? Reach for a trial frame when the patient benefits from natural head movement and real-world viewing, or when a phoropter is impractical. That includes pediatric and geriatric patients, low-vision and reduced-acuity exams, over-refraction, and home, bedside, or mobile-clinic visits. Many clinicians also do a final trial-frame check so the patient can experience the Rx before it is ordered, which helps reduce remakes. A phoropter is still faster for routine lens swapping and for measuring phorias and ductions, so most practices keep both.
What is the difference between a universal (adjustable) and a fixed-PD trial frame? A universal trial frame lets you dial in pupillary distance, temple length, nose-pad height, and tilt, so a single frame fits nearly any patient. A fixed-PD frame has a preset interpupillary distance printed on the body; it is lighter, faster to grab, and typically more economical, which makes fixed-PD frames and graduated sets popular for pediatric exams and high-volume screening. Many practices keep an adjustable frame for the primary lane and a fixed-PD set for quick or specialized use.
How many lenses does a trial frame hold, and do I still need a trial lens set? Trial frames hold roughly three to five lens cells per side, which lets you combine sphere, cylinder, and an accessory such as an occluder or pinhole at once. The frame itself does not include the lenses, so you also need a trial lens set (trial case) with the graduated spherical, cylindrical, and prism lenses plus accessories. We carry trial lens sets alongside our frames so you can outfit the full refraction workflow together.
Are trial frames suitable for pediatric and low-vision patients? Yes, and they are often the preferred tool for both. Lightweight frames and small, fixed-PD or graduated sets fit children comfortably and are quick to position, while the natural, binocular, real-world viewing a trial frame allows is especially valuable in low-vision and reduced-acuity refraction where phoropter refraction can be difficult. Choosing a light frame with a PD range that matches smaller faces makes these exams faster and more comfortable.
Do you provide warranty, service, and spare parts for your trial frames? Yes. US Ophthalmic is a US-based provider with an in-house technical and repair department, so your trial frames are backed by warranty coverage and spare-parts support rather than a one-time sale. If a knob, nose pad, or hinge needs attention, or you need help selecting the right frame or a matching trial lens set, our team can advise and support you directly. Request a quote and we will help you configure the right setup for your practice or lab.
