The effect of cooling rate on the precision of measurement of glow peak 5 in the thermoluminescence of LiF:Mg,Ti (TLD-100).

The effect of natural rapid cooling and oven slow cooling on the precision of thermoluminescence measurements of LiF:Mg,Ti is investigated. Three separate series of measurements resulted in average precisions of 5.1 and 5.

THE THERMOLUMINESCENCE (TL) DOSE RESPONSE OF COMPOSITE PEAK 5 IN LIF:MG,TI (TLD-100): DEPENDENCE ON THE ORDER OF KINETICS.

A seeming contradiction in the prediction of the spatially correlated trapping center/luminescent center model applied to LiF:Mg,Ti has been the linear/supralinear behavior of the dose response of glow peak 5a. In the TC/LC model, the localised electron-hole recombination, giving rise to glow peak 5a, is expected to result in an extended region of linear dose response. Deconvolution of the glow curves based on first order kinetic peak shapes results, however, in a dose response of peak 5a, which closely resembles the linear/supralinear dose response of peak 5.

RECENT DEVELOPMENTS IN COMPUTERISED ANALYSIS OF THERMOLUMINESCENCE GLOW CURVES: SOFTWARE CODES, MECHANISMS AND DOSIMETRIC APPLICATIONS.

The computerised deconvolution of thermoluminescence glow curves into component glow peaks is discussed in detail with special emphasis on advances of the subject post 2013. A plethora of computer codes have been developed using models based on first-order kinetics, second-orders kinetics, interactive traps and continuous distributions of activation energies. The glow curves of several materials are displayed and discussed along with new and improved dosimetric applications:precision effects of heating rate, heavy charged particles, mixed field α/ϒ dosimetry, fading and dose-response linearity.

[In vivo confocal microscopy evaluation of corneal changes induced after LASIK using the IntraLase femtosecond laser technique].

Purpose: To assess stromal modifications occurring after IntraLase femtosecond laser for laser in situ keratomileusis (LASIK) using the Heidelberg retina tomograph II/Rostock cornea module.

Material And Methods: Twelve eyes from six patients were examined using the Heidelberg retina tomograph II cornea module after IntraLase femtosecond laser: ten eyes were examined at 1 week and 2 months after laser surgery, including four eyes examined at day 1, and two eyes examined at day 2. Morphological modifications of the corneal stroma, flap interface, and flap margin were evaluated at these different times and compared with the mechanical microkeratome interfaces of five patients (ten eyes), using the same technique at the same periods after the surgical intervention.

[Corneal stromal changes after LASIK].

Purpose: To assess stromal modifications after laser in situ keratomileusis (LASIK) for myopia using in vivo confocal microscopy.

Methods: Thirteen eyes from 10 patients were examined before surgery and at days 8 and 30 after surgery using an in vivo confocal microscope coupled with a Z-Scan system. Stromal morphological changes, keratocyte density, flap thickness, and subclinical haze were evaluated and compared at different time points.

Evaluation of corneal stromal changes in vivo after laser in situ keratomileusis with confocal microscopy.

Purpose: To assess by in vivo confocal microscopy the modifications of the corneal stroma after laser in situ keratomileusis (LASIK) for myopia.

Design: Nonrandomized comparative (self-controlled) trial.

Participants: Sixteen eyes of 13 patients were examined before surgery and at days 8, 30, and 90, and 9 eyes were examined at 6 months postoperatively using an in vivo confocal microscope.

[Clinical outcome after in situ laser keratomileusis (LASIK) for myopia: a series of 390 eyes].

Purpose: We report our personal experience with LASIK for myopia to study its efficacy, safety, predictability and stability for low, moderate and high myopia.

Patients And Methods: Between January 1996 and December 1997, 390 eyes were treated. Follow-up was 6 months for 254 and one year for 136.

Angle-fixated anterior chamber phakic intraocular lens for myopia of -7 to -19 diopters.

Purpose: To assess the safety and efficacy of a second generation, anterior chamber phakic intraocular lens (Baikoff Model ZB5M) in patients with high myopia.

Methods: One hundred and twenty-one patients (134 eyes) with myopia of -7.00 to -18.

[Results of treatment of undercorrections of radial keratotomy by Excimer laser].

Photorefractive keratectomy (PRK) was performed with Excimer Laser after undercorrected radial keratectomy in 21 eyes of 15 patients (maximum 8 incisions, 3 mm optical zone). There was at least a 6-month interval between the two procedures. At the time of PRK, the mean age of the patients was 31 years and the mean spherical equivalent -2.

[Clinical results of photo-refractive keratectomy. Preliminary study with 57 eyes].

The authors report their personal experience of Photo-Refractive Keratectomy (PRK) with an Excimer Laser based on the study of 57 sighted eyes, 24 with more than six months and 11 with more than one year of follow-up. The initial myopia ranged from -1 to -13 D with a spherical average equivalent of -6.36 D.

[Retinal detachment recurrences. 2. Mechanisms and treatment (author's transl)].

Retinal detachment recurrences are almost always caused by vitreous tractions or vitreo-retinal retractions. Classical methods of prevention: as atraumatic surgery as possible, no superfluous subretinal fluid drainage, prevention of intraocular bleeding during drainage were employed in the series reported but with a 10.5 per cent recurrence rate.

[Pars plana lensectomy II - Short- and long-term complications].

Pars plana lensectomies or membranulectomies were performed on 67 eyes with posterior capsule removal in every case, with follow-up of 60 eyes for more than 3 months (mean: 18 months). No peroperative or early postoperative complication was specifically related to the procedure employed. Irvine's syndromes and retinal detachments were the two most severe late complications.

[Retinal detachment recurrences. 1. Frequency and risk factors (author's transl)].

Retinal detachment recurrence is defined the reappearance of a detachment after an initial complete success, whatever the delay between surgery and recurrence. This eliminates immediate failures due to inadequate buckles or major complications during surgery, exsudative retinal detachments that reattach spontaneously within a few days and cases where it is not sure that the retina had been completely reattached initially (cloudy media). Employing these criteria, a retrospective study demonstrated 130 eyes with recurrences out of a total of 1237 eyes operated between 1-10-69 and 31-12-79 (10,5 per cent rate); recurrences occurred in this series between 3 days and 7 years after initial surgery, 53,5 per cent of them within an interval of less than 3 months.