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2. Refractec viewpoint™ CK® system. Physician's reference guide for treatment of presbyopic emmetropes and hyperopes to improve near vision utilizing conductive keratoplasty® (CK®);United States FDA PMA P010018,2004
3. Conductive keratoplasty for the correction of low to moderate hyperopia: US clinical trial 1–year results on 355 eyes;McDonald;Ophthalmology,2002
4. Conductive keratoplasty for the correction of hyperopia;Asbell;Trans Am Ophthalmol Soc,2001
5. Treatment of presbyopia with conductive keratoplasty: six-month results of the United States FDA clinical trial;McDonald;Cornea,2004