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Biomedical subjects

P Giardini

Publications and source records attributed to P Giardini.

4 recordsLinked to original sources
PubMed1993

Pseudoaccommodation with the 3M diffractive multifocal intraocular lens: a refraction study of 52 subjects.

A refraction study was performed of 52 pseudophakic subjects implanted with a 3M diffractive intraocular lens (IOL). Twenty patients implanted with conventional monofocal IOLs from 3M were used as controls. The refraction for distance and near was determined, corresponding to the refractive (distance vision) and diffractive (near vision) foci. Pseudoaccommodation amplitude was measured relative to the variation of visual acuity as a function of "fogging" obtained with plus and minus lenses over any required spherical cylindrical power. Results showed that the 3M diffractive IOL acted as a bifocal lens in all subjects except those whose IOLs had decentered markedly. The dioptric range allowing good vision for distance and near is much wider with the diffractive IOL than it is with a monofocal IOL. Almost perfect vision, and the satisfaction of the patients, was achieved when the distance refraction was near to emmetropia and astigmatism was minimal. However, hyperopic biometric inaccuracies were less disturbing than myopic inaccuracies.

Accommodation, Ocular↗
PubMed1993

[Reduction modality of a dietary questionnaire].

The data relative to the average daily intake of 7 nutrients and total energy obtained through the answers to a dietary questionnaire, consisting of 152 items and administered to 200 patients (admitted for acute pathologies) has been analysed. The aim has been to elaborate a questionnaire consisting of a more limited number of items but maintaining a great part of the informative contents from the original questionnaire. For this aim, a multiple regression model with a selection procedure for independent variables, of the stepwise type, has been used, where the dependent variable is the daily average intake of the nutrient and the independent variables are the consumption of each food included in the complete questionnaire (QC). By combining the results of the model with the 7 nutrients and total energy, 3 reduced questionnaires have been produced (QR): the first two are based on the sole criteria of the inter-individual variance of the intake of the nutrient, explained by the consumption of the foods included in the QR, the third by adding the foods that offer an adequate contribution in order to explain the supply of the nutrient under examination. The application potentials of the 3 QRs have been analysed both by evaluating the inter-class correlation coefficient, deduced by an concordance/discordance matrix relative to the quintilis values of the nutrient deduced by the QC and by each QR, and by simulating their use in a case-control study; for this aim, the attenuation of the odds ratio trend and the increase of the sample dimension has been calculated following the use of a QR instead of a complete one.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1992

Prospective study of pupil motility in pseudophakia.

We operated on 148 patients with age-related cataracts using the envelope technique and intraocular lens implantation in the capsular bag. Pupil diameters were measured on the day before surgery and again two months after. In pseudophakic eyes, morphologic examinations revealed 80 intact pupils, 32 pupils with slight changes, and 36 pupils with marked alterations. However, no substantial alterations in pupil diameter were observed. The photopic diameter, which was enlarged by approximately 17%, was the exception. Near pupil reactivity showed a 28% reduction; reactivity to light was decreased by 26%. The abnormalities were more frequent after complicated operations and in older patients, but it was not possible to predict postoperative diameters in individual cases.

Aged↗