Specification Brand : THYXGS BulletPoint1 : 【Product parameters】: Aperture: about 24 mm (0.945 inches); Product weight: 1.63 pounds (0.74kg); Product size: 10.9 x 0.2 inches (27.8 x 0.5 cm). BulletPoint2 : 【Quick optometry】: Each plastic handle has 5 lenses of different degrees, 8 groups of ±0.25D~±10.00D, a total of 40 ophthalmoscopes (half for far/half for near), which helps to quickly check the refractive power of the eyes. BulletPoint3 : 【Hyperopia/Myopia】: 0.25, 0.50, 0.75, 1.00, 1.25, 1.50, 1.75, 2.00, 2.25, 2.50; 2.75, 3.00, 3.50, 4.00, 5.00, 6.00, 7.00, 8.00, 9.00, 10.00. BulletPoint4 : 【Product details】: non-slip and comfortable handle, easy to use; used for rapid refraction examination, accommodation reaction examination, and training of optometry accommodation function. BulletPoint5 : 【Exquisite craftsmanship】: environmentally friendly materials and high-quality optical glass, high light transmittance, fine workmanship, edges that will not cut hands, exquisite aluminum box, lock design, built-in foam, safe protection of optometry lenses. ExternallyAssignedProductIdentifier : 8049515690223 ItemName : THYXGS 40 Lenses Optical Retinoscopy Rack Lens Set for Quick Examination of Diopter Spectacles, ±0.25D to ±10.00D, Red for Myopia/Black for Hyperopia, with Aluminum Case ItemPackageDimensions_Height : 8 centimeters ItemPackageDimensions_Length : 14 centimeters ItemPackageDimensions_Width : 9 centimeters ItemTypeKeyword : professional-medical-retinoscopes Manufacturer : THYXGS ModelName : Generic195hkqao7g ModelNumber : Generic195hkqao7g PartNumber : YZ0152004752 ProductDescription : Product parameters: Product name: Optical retinoscope lens set Light aperture: about 24mm/0.9in Specifications: 8 pieces of ±0.25D~±10.00D, a total of 40 plastic handles (half for far/half for near) Product material: high-quality optical glass Outer box size: 320x146x70mm Product weight: 0.74kg Product use: rapid refraction examination, accommodation reaction examination, training of optometry accommodation function