An excellent sized trial lens set for those who do not need full compliment of lenses supplied in the Standard Set. The Primary Trial Lens Set includes the most common lens powers needed to perform a complete refraction, yet it is smaller, lighter, and more portable. Primary Plus or Minus Cylinder Sets come with 118 pieces, including spheres (in pairs) from 0.25D to 16.00D, and cylinders from 0.25D to 4.00D. Complete sets of both plus and minus come with a total of 136 pieces. All Primary Trial Lens Sets include Individual Prisms of 2, 4, & 6. Each set also includes an auxillary slit, Red filter, Green Filter, 1mm Pinhole, and Occluder in trial rims. Rims and handles of all Plus Spheres are plated black to distinguish them from Minus Spheres, even in low light. The Primary Trial Lens Set comes with an attractive, durable, carrying case (15.5" x 13.5" x 2.75"), and the entire inner lens tray is removeable for use in a standard office cabinet.