Pediatric Cataract Surgery and IOL Implantation by Unknown

Author:Unknown
Language: eng
Format: epub
ISBN: 9783030389383
Publisher: Springer International Publishing

Prescribing Considerations

Overcorrection

When prescribing optical correction for a pediatric aphakic patient, overcorrection is a necessity. Overcorrection is the process of adding additional plus power to the retinoscopy results to compensate for the lack of accommodation in aphakic patients. This is especially important for infants as they are highly stimulated by near objects and depend on clarity of their near world to make critical visual connections. Depending upon the age, the amount of overcorrection will vary, as the older a child becomes the more their visual world transitions from all near objects to a combination of distance and near stimuli. For example, a 6-month-old aphakic patient whose refraction is found to be +20.00 DS should be given a spectacle prescription for +23.00 DS. This additional plus power will set the focal length for the patient at 33 cm, which is the arm’s length of an infant. The focal length is important as it should be the distance an infant is able to hold and view objects with their glasses in place. In general, when any concerns arise with overcorrection it will optically be in the patient’s best interest to prescribe more plus power as the patient can always move the object closer to adjust for the focal point, but cannot necessarily extend the object further if an inadequate amount of power is given.

A general guideline for overcorrection can be seen in Table 12.1.Table 12.1Refractive overcorrection for aphakic patients

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