Trial Frame

A trial lens set, also known as a trial lens kit or trial frame set, is a collection of lenses used by optometrists and ophthalmologists during eye examinations to determine a patient's prescription for corrective lenses, such as glasses or contact lenses. These sets typically contain a variety of lenses with different optical powers and specifications, allowing the eye care professional to conduct a comprehensive refraction test and find the most suitable prescription for the patient. Lens Types: Trial lens sets typically include spherical lenses, cylindrical lenses, and prism lenses. Spherical lenses correct for nearsightedness (myopia) or farsightedness (hyperopia), while cylindrical lenses correct for astigmatism. Prism lenses are used to correct alignment and binocular vision issues.
Lens Powers: The lenses in a trial lens set come in a range of powers, usually measured in diopters (D), which indicate the strength of the lens. Positive (+) powers are used to correct hyperopia, while negative (-) powers correct myopia. Cylinder lenses also have a cylindrical power component to correct astigmatism.
Lens Diameter and Thickness: Trial lenses come in various diameters and thicknesses. Thicker lenses may have higher powers or prisms, while smaller diameters are used for more precise testing.
Lens Material: Trial lenses are typically made of high-quality optical glass or plastic materials that provide accurate refractive properties and durability.
Mounting System: Trial lenses are often mounted in metal or plastic rims that fit into a trial frame. The trial frame allows the eye care professional to hold and position the lenses in front of the patient's eyes during the refraction test.
Accessories: Some trial lens sets may include additional accessories, such as lens holders, lens cleaning tools, and a carrying case for convenient storage and transportation.
During a refraction test, the eye care professional uses the trial lens set along with a phoropter or trial frame to present different lens combinations to the patient and determine the best prescription for optimal vision correction.

Product description
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Advantage
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Features:

Top-grade quality View Tester in Far East

Elegant design butterfly-shape appearance, High grade plated-film used in all optic lenses.

This deivce is applicable to ophthalmology department of hospitals and spectacle store for precision measurement of visual functions such as myopia, hyperopia, astigmatism, eyesight balance, heterophoria, stereoscopic vision and eyesight amalgamation



Specification:

Sphere power range:+16.75D to 19.00D w/minimum reading 0.25D or 0.12D

(when using +0.12D auxiliary lens or optional±0.12D lens)

Cylinder power range:0 to -6.00D, w/minimum reading 0.25D or 0.12Dï¼?auxiliary lens)

0 to -8.00D(-2.00D auxiliary lens)

Astigmatic axis scale: 0 to 180° in 5° steps

Cross cylinder:±0.25D, reversal type (synchronized with astigmatic axis)

Rotary prism:0 to 20 D in 1 D steps

P.D. adjustment:48-80mm; step 1

Forehead rest adjustment:16mm

Convergence:the optical axes of the lenses are aligned at a distance of 400mm from enable convergence=57mm to 80mm.

Corneal distance:2mm forward and 5mm backward from standard plane with scale?

Effective field of view:19mm

Product size:291-323mm*315mm*85mm

Package size:470mm*440mm*220mm

N.W./G.W.: 5kgs / 6.5kgs