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Biomedical subjects

M Guillon

Publications and source records attributed to M Guillon.

32 records · Page 2Linked to original sources
PubMed1986

Automated refraction in aphakia--II. Its repeatability and accuracy compared to conventional techniques.

The repeatability and accuracy of an i.r. electronic optometer (the Ophthalmetron) and of retinoscopy performed by experienced practitioners were studied in aphakia by testing a group of 17 patients three times with each method and by subjective techniques. The results show that the Ophthalmetron gives better repeatability than retinoscopy and that accuracy is marginally better for the sphere with the Ophthalmetron and for the cylinder power by retinoscopy when the mean of the three subjective results is taken as the true refractive value.

Adult↗
PubMed1986

Tear layer thickness characteristics of rigid gas permeable lenses.

The tear layer thickness profiles of two groups of clinically successful wearers of rigid contact lenses were calculated from the measured anterior corneal surface and posterior contact lens surface characteristics. These profiles showed good agreement with their theoretical values for all parameters considered. However, as large individual variations were found, it was concluded that the tear layer thickness profile is only one of the descriptive factors needed to classify the fitting relations of rigid lenses.

Contact Lenses↗
PubMed1986

Corneal topography: a clinical model.

A keratometric photokeratoscopic study of 220 eyes representative of a normal population leads to the ellipsoid corneal model proposed. This model is applicable to the design of rigid corneal lenses and to the calculation of computer models of the dioptric system of the eye. The results obtained show that there is a systematic difference between central keratometric and photokeratoscopic measurements that is statistically but not clinically significant, a significant number of corneas steepen at the periphery, the corneal shape varies greatly with a normal population and peripheral and central astigmatisms are usually similar.

Anthropometry↗
PubMed1983

Comparative study of the visual performance of various aphakic corrections.

The aim for the present study was to test the feasibility of using a front surface aspheric contact lens geometry to correct aphakic patients from a visual standpoint. Two aspheric contact lens designs are tested, using a standard visual acuity test and contrast sensitivity, and their performance is compared to a conventional spherical design. An hyperbolic front surface of eccentricity of 1.2 was chosen, as its performance was similar to the spherical contact lens.

Adult↗
PubMed1980

Corneal swelling response of the aphakic eye.

Corneal swelling response was measured for 12 unilateral aphakic subjects wearing high-plus hydrogel contact lenses on both eyes. Significantly less corneal edema was measured for aphakic eyes than for phakic eyes after 2, 4, and 6 hr of lens wear. These results indicate that the cornea of the aphakic eye responds differently to a given physiologic challenge than does the cornea of the phakic eye. Previous estimates of oxygen permeability required of contact lens materials for extended wear may be artificially high for aphakic eyes.

Aged↗
PubMed1979

Keratoconus, keratoplasty thickness, and endothelial morphology.

A group of successful keratonic grafts (51 eyes) up to 10 years from operation were examined to establish a relationship between graft thickness and acuity. Best acuity occurred in the grafts of normal corneal thickness. No grafts were thinner than normal; thus no tendency to keratonic thinning occurred. No relationship between age of graft and thickness was determined. Endothelial cell studies in vivo of a small number of grafts showed that cell counts a third of normal coexisted with normal acuity and corneal thickness.

Cornea↗
PubMed1979

'Silicone rubber' lenses in aphakia.

Tesicon, one of the commercially available 'silicone rubber' lenses, was used in the correction of aphakic patients. In 74% of cases the lenses were considered successful for a daily wear regimen by the patient. Furthermore, a small number of patients could wear this lens without interruption for 3 to 6 days at a time. Despite this good acceptance by patients, corneal problems (mainly staining) and lens problems (dry surfaces) were frequently encountered.

Adolescent↗
PubMed1976

[Incidence of mother-child contamination by Candida albicans during labor].

Two different studies assessed that materno-fetal contamination at time of delivery is not the usual way of colonization of newborns with Candida albicans. In a first study, occurence of Candida albicans in neonate units disappeared owing to prophylactic measures, such as strict care in hospital hygiene. In a second study, detailed herein and performed in an obstetric ward, it was found that despite a rate of vaginal Candida carrier of 19 %, candidiasis in newborns was exceptional.

Candidiasis↗