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Hold three pairs of trial lenses. Adjustable PD from 59 to67 mm xed bridge. Temples adjust. Drop sell style goesnot hold the trial lenses tightly. Also, available with anadjustable nose rest as listed child versions have adjustablePD from 54 to 58 mm. weight 1.0 oz (29 grams)...

Eye Models (Right Eye Model Card Model 6188)..

* Facilitates vision testing at the exactdistance and height.* Fast precise measurement* Low cost...