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Accommodating intraocular lenses a critical review

In addition, distance-corrected pseudophakia results in an iatrogenic presbyopia that results from the implantation of a monofocal intraocular lens (IOL).Since both conditions affect near visual properties, particularly the ability to read, presbyopic and cataract patients share the desire to regain a comfortable reading ability.

J1 is just comparable to a decimal acuity of 0.63 (Snellen: 20/32) at 32 cm, and J2 corresponds to a visual acuity of 0.43 (Snellen: 20/47) instead of 0.5 (Snellen: 20/40).

Between J3 and J4, the print sizes differ by almost 2 log units.

The last three reading charts are available in several languages.

An innovative example for homologating a well-recognized reading chart with modern standards is the Oculus Reading Probe, which is a printed chart using long paragraphs.

Presbyopia correction is mainly concerned with the goal of regaining an uncorrected reading performance.

Since historic reading charts do not provide a unique standard that is applicable for the analysis of clinical and scientific reading performance, new standardized reading charts have been developed, in order to provide reading performance analyses analogous to modern single-optotype distance acuity measurements: the Bailey-Lovie Word Reading Chart, the Colenbrander English Continuous Text Near Vision Cards, the MNREAD Charts, and the RADNER Reading Charts.

The backgrounds of these homologated logarithmic reading charts are discussed with regard to the advantages they offer for research and clinical purposes in the field of presbyopia.).

Their print sizes (letter heights) are not standardized and do not logarithmically progress because of the limitations of earlier printing techniques.

Whereas age-related presbyopia usually is corrected with reading glasses, sufficient reading acuity after cataract surgery can be achieved with several types of presbyopic correction: (a) with monofocal IOLs and reading glasses, (b) with contact lenses [].

Given that reading is an important visual task in our information-based society, and cataract and refractive surgery ideally aims to restore a comfortable reading ability, there is increasing clinical interest in scientifically investigating the postoperative reading performance of such patients [].

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