Aniseikonia for near vision with unilateral aphakia corrected by intraocular lenses.
1. Our methods for calculation of aniseikonia for near vision allow one to determine it in every patient with an intraocular lens. 2. With an eye with an artificial lens there is a correlation between the amount of accommodation used by the phakic eye and aniseikonia changes subject to the distance from the object. Calculations for aniseikonia for near vision in 43 patients showed that with accommodation used by the normal eye aniseikonia was increased by 3.0% to 7.8% as compared with aniseikonia for distance. With accommodation of the phakic eye lacking, aniseikonia for near vision did not differ much from its value for distance. 3. Calculations for aniseikonia for near vision showed the advantage of intraocular lens implantation for obtaining iso-iconia for distance or tolerable aniseikonia not more than 2.5% to 3.0%. 4. For obtaining iso-iconia for near vision it is necessary to correct the phakic eye to switch off its accommodation partially or completely (with emmetropia, correction +2.0D for near vision).
D000065:Accommodation, Ocular; D000293:Adolescent; D000328:Adult; D000839:Aniseikonia / Q000150:complications / Q000175:diagnosis / Q000628:therapy*; D001036:Aphakia, Postcataract / Q000150:complications / Q000628:therapy*; D006801:Humans; D006956:Hyperopia / Q000150:complications; D007910:Lenses, Intraocular / Q000592:standards*; D009216:Myopia / Q000150:complications; D012029:Refraction, Ocular