Peripheral vision and hazard detection with average phakic and pseudophakic optical errors

• Intraocular lens (IOL) implantation following cataract extraction is the most common ophthalmic surgical procedure across the world. The IOL designs are constantly evolving and the postoperative visual outcomes are also improving significantly [1-3]. However, these reported outcomes are measured mainly for the central vision. Similar to other forms of vision correction such as spectacle lenses and contact lenses, IOLs are also designed to provide optimal image quality in the central visual field. Both theoretical and experimental evidence suggest that the peripheral optical errors are larger in eyes implanted with spherical and aspherical monofocal IOLs than phakic eyes [4-7]. Tabernero et al., reported an increase in the peripheral optical errors by analysing eyes that were implanted with monofocal IOLs from a variety of manufacturing companies and different optical designs, both spherical and aspherical [4]. The gradient index of the crystalline lens in the phakic eyes is suggested to partly compensate for the peripheral corneal astigmatism and the replacement of the crystalline lens with an IOL of constant index therefore results in higher The impact of peripheral optical errors induced by intraocular lenses was evaluated by simulating the average phakic and pseudophakic image qualities. An adaptive optics system was used to simulate the optical errors in 20 degrees nasal and inferior visual field in phakic subjects. Peripheral resolution acuity, contrast sensitivity and hazard detection were evaluated. Pseudophakic errors typical for monofocal designs had a negative effect on resolution acuity and contrast sensitivity and the hazard detection task also showed increased false positive and misses and a longer reaction time compared to phakic optical errors. The induced peripheral pseudophakic optical errors affect the peripheral visual performance and thereby impact functional vision.

Ämnesord

MEDICIN OCH HÄLSOVETENSKAP  -- Klinisk medicin -- Oftalmologi (hsv//swe)

MEDICAL AND HEALTH SCIENCES  -- Clinical Medicine -- Ophthalmology (hsv//eng)

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