Examples of refractive error are myopia, hyperopia, presbyopia and astigmatism. Other types of refractive error are hyperopia, astigmatism, and presbyopia. Premium intraocular lenses are those used in correcting presbyopia or astigmatism. Refractive errors include near-sightedness, far-sightedness, presbyopia, and astigmatism. The most common use is to treat refractive errors&colon; myopia, hypermetropia, astigmatism, and presbyopia. The most common types of refractive error are near-sightedness, far-sightedness, astigmatism, and presbyopia. The American scientist Benjamin Franklin, who suffered from both myopia and presbyopia, invented bifocals. Other types of refractive errors may exist at the same time as presbyopia. A type of LASIK, known as presbyLasik, may be used in presbyopia. Laser blended vision treatment is suitable for people suffering from presbyopia. In the case of the overcorrection, premature presbyopia is a possibility. Eye drops to constrict the pupil are being studied for presbyopia. The onset of presbyopia varies among those with certain professions and those with miotic pupils. Primarily the treatment is for a condition called presbyopia. Additionally, many of these people have reached the age where presbyopia occurs.