Oculab Tono-Pen tonometry was compared with Goldmann applanation tonometry in 82 eyes of 82 patients with normal corneas and in 54 eyes of 54 patients who had undergone penetrating keratoplasty and whose corneas did not preclude the use of the Goldmann tonometer. We found that the intraocular pressure (IOP) This instrument has certain advantages over the Goldmann applanation tonometer. It is portable and compact, can be used regardless of the patient position, is easy to calibrate and operate, has a disposal tip cover which eliminates contamination risks, and the digital readout minimises user bias. Because of its small contact diameter (1I5 mm) the Tono-Pen was recommended for the measurement of the IOP in eyes with irregular corneas. ' Our goal was to try to find if the IOP differences between Tono-Pen and Goldmann in normal eyes would be similar in post-keratoplasty eyes which often have large and irregular astigmatism. In addition, we wanted to find a correction factor for the Tono-Pen which could be used to make it clinically comparable with the Goldmann tonometer. Figure 1 shows the regression line of the TonoPen IOPs compared with Goldmann IOPs (y= 0 87,x+5 63, correlation coefficient 0-83) in eyes with regular corneas. Table 1 compares the measurements of both tonometers, in terms of mean paried differences and mean absolute value of paired differences in normal eyes. The analysis is divided into several Goldmann tonometry based IOP intervals. There were significant differences between the two instruments (-3 59 (SD 0 36) mm Hg, p<0-oo0l). Figure 2 displays the distribution of paired IOP differences in the group of normal eyes. Most of the measurements are situated left of the zero, representing overestimation of the TonoPen; only 52% of the Tono-Pen measurements 538 on 11 May 2018 by guest. Protected by copyright.

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BACKGROUND: A variety of patterns of keratotomy are used to correct naturally occurring astigmatism. We evaluated straight transverse incisions with interrupted radial incisions (jump radiais). METHODS: In 32 human eyes with naturally occurring astigmatism, we used straight transverse incisions with interrupted radial incisions, with or without additional radial keratotomy, to correct compound myopic astigmatism. The range of preoperative refractive astigmatism was 1.00 to 3.50 D. RESULTS: The mean follow-up time was 15 months (range, 12 to 16 months). The average surgically corrected astigmatism was 1 .55 ± 0.29 D. Eightyseven percent of the eyes achieved less than 1 .00 D of astigmatism, and the remaining four eyes retained 1 .00 to 1 .25 D of astigmatism. CONCLUSION: Combined transverse and interrupted radial incisions are effective in correcting naturally occurring astigmatism. [Refract Corneal Surg 1992;8:280-285.) RÉSUMÉ INTRODUCTION. Différentes variétés de kératotomie ont été utilisées dans le traitement de l'astigmatisme myopique congénital. Nous avons évalué l'effet des incisions transverses associées à des incisions radiaires discontinues. METHODES. Nous avons réalisé des incisions transverses droites associées à des incisions radiaires discontinues dan le traitement de l'astigmatisme congenital de 32 yeux. Des incisions radiaires transverses ont été réalisées si nécessaire pour traiter l'élément myopique de l'astigmatisme. RESULTATS. Le recul moyen était de 15 mois (12 à 18 mois). La correction chirurgicale de l'astigmatisme était de 1.55 ± 0.29 D. 87% des yeux étaient corrigés à moins de 1 .00 D, seuls 4 yeux étaient entre 1.00 et 1.25 D. CONCLUSION. L'association incision radiaire discontinue et transverse est efficace dans la correction de l'astigmatisme congénital. (Translated by Jean Marc Legeais, MD, Paris, France.) SOMMARIO PREMESSA. Una varietà di modelli di cheratotomia sono usati per correggere l'astigmatismo congenito (primario); noi abbiamo valutato le incisioni rette trasverse con incisioni radiali interrotte (radiali a salto). METODI. In 32 occhi con astigmatismo congenito abbiamo usato le incisioni rette trasverse con incisioni radiali interrotte con o senza tagli radiali addizionali per correggere astigmatismo miopico composto. L'estensione dell'astigmatismo preoperatorio era fra 1 .00 a 3.50 diotric. RESULTATI. Il follow up medio era di 15 mesi (da un minimo di 12 ad un massimo di 18 mesi). L'astigmatismo medio corretto chirurgicamente era 1 .55 ± 0.29 D. L'87% degli occhi ha ottenuto meno di 1 .00 D di astigmatism ed il rimanente 4 occhi ha mantenuto da 1 .00 a 1 .23 D di astigmatismo. CONCLUSIONI. Le incisioni trasverse combinate alle radiali interrotte sono efficaci nel correggere l'astigmatismo congenito. (Translated by Lucio Buratto, MD, Milan, Italy.)

Two cases are reported in which pupillary pigment occlusion occurred after argon laser iridotomy, reducing visual acuity and preventing fundus visualization. Laser-induced inflammation and subsequent long-term miotic therapy are probably responsible for this complication. Periodic pupillary dilatation is recommended in eyes that require miotics to control their intraocular pressure after laser iridotomy.