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refraction, ocular

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$Refraction and Retinoscopy: How to Pass the Refraction Certificate (MasterPass)$ Refraction and Retinoscopy: How to Pass the Refraction Certificate (MasterPass) from $132.27	$Clinical Optics and Refraction: A Guide for Optometrists, Contact Lens Opticians and Dispensing Opticians$ Clinical Optics and Refraction: A Guide for Optometrists, Contact Lens Opticians and Dispensing Opticians $89.50 from $75.00
$Subjective Refraction and Prescribing Glasses: The Number One (or Number Two) Guide to Practical Techniques and Principles, Third Edition$ Subjective Refraction and Prescribing Glasses: The Number One (or Number Two) Guide to Practical Techniques and Principles, Third Edition from $44.99	$3Pcs Diffraction Glasses, 3D Prism Rainbow Heart Star Effect Light Refraction Glasses Rave Glasses Women Men for Edm Party$ 3Pcs Diffraction Glasses, 3D Prism Rainbow Heart Star Effect Light Refraction Glasses Rave Glasses Women Men for Edm Party from $16.99
$Last-Minute Optics: A Concise Review of Optics, Refraction, and Contact Lenses, Second Edition$ Last-Minute Optics: A Concise Review of Optics, Refraction, and Contact Lenses, Second Edition from $63.99	$Fireworks Diffraction Glasses (50 Rainbow Spectrum Frames + 1 Exclusive Bonus Pair) - Foldable Paper/Cardboard Frames - 51 Glasses Total$ Fireworks Diffraction Glasses (50 Rainbow Spectrum Frames + 1 Exclusive Bonus Pair) - Foldable Paper/Cardboard Frames - 51 Glasses Total from $25.49
$Rob's Super Happy Fun Store Fireworks Diffraction Glasses - 50 Starburst Effect Diffraction Glasses Plus1 Rainbow Hearts Effect Diffraction Glasses$ Rob's Super Happy Fun Store Fireworks Diffraction Glasses - 50 Starburst Effect Diffraction Glasses Plus1 Rainbow Hearts Effect Diffraction Glasses from $24.99	$Kopida Glass Crystal Triangular Prism, Rainbow Maker for Light Refraction Spectrum Learning, Photography Science Physics Teaching Prop$ Kopida Glass Crystal Triangular Prism, Rainbow Maker for Light Refraction Spectrum Learning, Photography Science Physics Teaching Prop from $6.64
$Fireworks Diffraction Prism Glasses - Trippy Tie Dye and Rave Waves Frame Designs - 50 Paper Glasses Total - See Rainbow Bursts of Color From Prismatic Lenses$ Fireworks Diffraction Prism Glasses - Trippy Tie Dye and Rave Waves Frame Designs - 50 Paper Glasses Total - See Rainbow Bursts of Color From Prismatic Lenses from $25.74	$United Scientific Supplies RCSC01 Semi-Circular Refraction Cell, 12 cm Diameter, 2.5$ United Scientific Supplies RCSC01 Semi-Circular Refraction Cell, 12 cm Diameter, 2.5" Height from $5.56