Description
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Product description
- The Green–Yellow Penlight is a dual-color LED torch that switches instantly between green and yellow illumination so you can tailor light to the task and patient comfort. Green gives high contrast with minimal glare (great for pupil checks, Hirschberg, and fixation/EOM cues), while yellow provides a warm, comfortable tone that’s less startling—useful for pediatrics and light-sensitive patients. The slim, pocket-clip body, tactile push-button, and replaceable batteries make it a hygienic, one-handed workhorse for clinics and screening camps.
- Two color modes: Green for crisp reflexes/landmarks with reduced glare; Yellow for comfortable, low-aversion illumination
- Clinical uses: PERRL (direct/consensual), swinging flashlight test, Hirschberg, fixation/EOM cues, anterior-segment lighting
- Ergonomics: Slim metal body with pocket clip and positive push-button for quick, one-hand operation
- Patient friendly: Yellow mode helps with pediatrics and photophobic patients; green enhances contrast on lids/iris
- Hygiene & durability: Smooth, wipe-clean housing; stands up to daily disinfection
- Power: Replaceable batteries for reliable, all-day use
- Tips: Dim room lights for pupil testing; approach from the side to avoid accommodative responses; document latency and symmetry of reactions
- Care: Wipe with approved disinfectant (don’t soak); avoid harsh solvents; remove batteries for long-term storage
| Topic | Details |
| Catagory | Vision Therapy |
| Purpose / Target Users | The Yellow–Green Pen Light is a specialized handheld light source used in vision therapy,ocular health evaluation, and pupil response testing.The yellow-green LED light provides enhanced contrast sensitivity, making it useful for fixation tasks, pupil assessments, and tracking exercises, especially in low-light or controlled clinical settings.Target users include optometrists, ophthalmologists, vision therapists, school screening teams, and eye care professionals who need a bright but gentle fixation light for various tests and therapy activities. |
| Optotypes / Symbols | No optotypes or printed symbols are used. Instead, the narrow, high-contrast yellow-green light beam functions as a fixation target to help patients focus during tracking, pupillary, and binocular vision exercises. The unique color is especially effective for attracting attention and minimizing glare. |
| Scaling / Spacing | The pen light does not use printed scaling, but the controlled and focused LED beam allows the examiner to precisely adjust working distances and light placement, maintaining standardized testing conditions (e.g., for NPC and fixation tasks). The beam size remains uniform and narrow, aiding in accurate evaluations. |
| Range of Acuity / Line Sizes | Not applicable for acuity measurement. However, the bright yellow-green light can be used as a visual stimulus for accommodation, convergence, and tracking exercises at various distances (typically 5–40 cm), helping maintain consistent fixation without the need for charts or symbols. |
| Testing Distance | Pupillary Testing: Typically performed at 15–30 cm from the patient’s eyes to evaluate direct and consensual light reflexes. NPC (Near Point of Convergence) Testing: The light is moved from 40 cm toward the patient’s nose to measure convergence break and recovery points. Fixation / Tracking Exercises: Used at 40 cm or closer, moved horizontally, vertically, or diagonally to evaluate and train smooth pursuits and saccades. The yellow-green wavelength is particularly useful for maintaining patient focus during longer exercises. |
| Physical Size & Dimensions | Length: Approximately 13–15 cm (pen-shaped), Diameter: Around 1–1.5 cm Weight: Lightweight (20–30 g) for easy handling. The pen-style design allows for comfortable grip, precise pointing, and easy pocket storage. |
| Mounting / Display Features | Pocket Clip: Built-in clip for secure attachment to a coat, shirt pocket, or clipboard. No fixed mounting required — it is a handheld device for maximum flexibility in various clinical and therapy environments |
| Included Accessories / Extras | Batteries (AAA or AA) are typically included, depending on the model. Some units come with spare LED bulbs or a soft protective pouch. May feature a simple on/off push-button or clip switch for ease of use. |
| Durability / Material Qualities | Material: Crafted from high-grade aluminum or stainless steel, ensuring long-term durability and resistance to daily wear, corrosion, and cleaning agents. Finish: Smooth yellow-green outer finish for quick identification and professional presentation. LED: Energy-efficient, non-heating, and long-lasting LEDs ensure stable performance. – Resistant to frequent disinfection and rough clinical handling. |
| Usability / Marker of Quality | Lightweight, ergonomic design enables stable and precise light control with one hand. – Easy push-button or clip switch provides quick operation during patient testing.- Bright, focused yellow-green light – Widely used in professional optometry and vision therapy environments for its unique wavelength advantages, reliability, and clinical precision.offers superior visibility and attention without excessive glare. – Quality markers include: consistent light output, smooth switch function, strong battery life, and a robust metallic body. |
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