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JVCTF Universal Clinical Frame
JVCTF Universal Clinical Frame - Image 2
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JVCTF Universal Clinical Frame

The term “JVCTF” Universal Clinical Frame appears to be referring to the Joint Task Force for Clinical Trial Competency (JTF) Core Competency Framework, a widely recognized global standard in clinical research. The JTF framework defines the universal knowledge, skills, and attitudes necessary for conducting safe, ethical, and high-quality clinical trials

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Product description

  • Universal Applicability: It was designed to be globally relevant and applicable across various roles and regions, despite differences in local regulations.
  • Core Competency Domains: The framework is structured around 8 core domains that cover all aspects of the clinical research enterprise

TopicDiscription
Purpose / Target Users

Purpose / Target Users
Purpose : A clinical trial frame is used during subjective refraction testing to hold combinations of trial lenses in front of a patient’s eyes. It enables precise evaluation of refractive errors and lens prescriptions. Target Users: Ophthalmologists and Optometrists in hospitals, clinics, and private practices.Optometry students in training institutions.Vision research professionals conducting optical and visual function studies.
Optotypes / Symbols

Optotypes / Symbols
The trial frame itself does not include optotypes. The trial frame itself does not include optotypes.
It is used in conjunction with visual acuity charts (Snellen, LogMAR, Landolt C, Lea symbols, or Tumbling E) depending on the clinical protocol.
Scaling / SpacingInterpupillary Distance (IPD): Adjustable, typically 48 mm – 80 mm (fine-tuned independently for each eye). Lens Cell Diameter: Standard 38 mm (to fit all ISO-standard trial lenses). Lens Spacing: 3–4 lens holders per eye (usually 2 front, 1 rear, optional auxiliary slot). Axis Scale: Clearly marked 0°–180° in 5° increments for precise cylindrical lens alignment. Vertex Distance: Adjustable 5–25 mm for optimal optical center alignment. Pantoscopic Tilt and Temple Length: Adjustable to match patient’s facial anatomy.
Range of Acuity / Line SizesThe frame itself does not define visual acuity lines, but it supports testing across the entire acuity range (from very poor vision up to 6/5 or 20/10), depending on the lenses and chart used
Testing DistanceDesigned for both: Distance testing: typically 6 meters (20 feet) Near testing: typically 33–40 cm with near vision cards or reading charts
Physical Size & DimensionsPhysical Size & Dimensions : Width: 130–160 mm (adjustable) Height: ~50 mm Weight: 70–120 g (depending on material) Lens Holder Diameter: 38 mm (ISO standard)
Mounting / DisplayMounting Type: Head-mounted (like eyeglasses). No external stand or mounting is required. Designed for hands-free use during testing.
Features

Features
Multi-lens capacity: Holds 3 or 4 trial lenses per eye (spherical, cylindrical, prism, or accessory lenses). Independent PD adjustment for right and left eyes. Smooth rotating axis dials with degree markings for accurate astigmatic axis control. Adjustable nose bridge (height and width) for comfort and proper centration. Lightweight ergonomic frame design for prolonged clinical use. Metal or high-grade polymer body with anti-corrosive coating. Balanced weight distribution to minimize patient fatigue.
Included Accessories / ExtrasIncluded Accessories / Extras
Standard inclusions: Protective storage or carrying case, Protective storage or carrying case, Instruction/user manual Optional accessories: Replacement nose pads Cleaning cloth Lens marking pen
Durability / Material QualitiesDurability / Material Qualities
Frame Material: High-strength anodized aluminum or medical-grade polymer (ABS or polycarbonate). Lens holders: Brass or stainless steel for precision and long-term wear resistance. Finish: Corrosion-resistant, smooth mechanical movement with high stability. Longevity: Designed for daily clinical use and regular sterilization.
Usability / Marker of QualityEase of Use: Quick lens insertion and removal mechanism. Smooth, precise rotation of all mechanical components. Clearly visible white-on-black engraved scales. Balanced and comfortable fit for extended testing. Quality Indicators: Certified under ISO 15004 / CE Medical Device standards. Accurate, durable axis and PD calibration. Trusted manufacturers (e.g., Heine, Topcon, Appasamy, Reichert, Shin-Nippon). Minimal mechanical play and firm lens locking.

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