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Results for “Cyclopentolate”

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At least 361 records · Page 20Linked to original sources
PubMed1991

Convergence accommodation: laboratory and clinical evaluation.

The accommodation stimulated by convergence, CA/C, was measured under laboratory and clinical conditions. There was a small nonlinearity to the CA/C ratios measured under laboratory conditions for three of six subjects. We found that convergence accommodation decreases with decreasing accommodative amplitude but not as rapidly as has been reported in the literature. Our results suggest that convergence accommodation can contribute substantially to the near accommodative response for many patients.

Accommodation, Ocular↗
PubMed1990

A comparison of cycloplegic refraction to the near retinoscopy technique for refractive error determination.

The near retinoscopy technique of refractive error determination was compared to the standard method of cycloplegic refraction using 10 "infants" (3-12 months of age) and 10 "children" (32-109 months of age). There was a significant difference between the techniques for both sphere and cylinder power. Although there was no interaction of refractive technique and age group, the difference between near retinoscopy and cycloplegic refractive error tended to be larger for infants than for children. No significant difference was found when the average refractive values were compared for monocular or binocular conditions and no significant effect was found for either gender or laterality (right versus left eye). Based on these findings, it is suggested that caution be used in substituting the near retinoscopy technique for cycloplegic refraction even utilizing a "correction" factor for the dioptric difference between techniques.

Analysis of Variance↗
PubMed1989

Ocular refraction with body orientation.

Body inversion is used experimentally to raise the intraocular pressure (IOP). Psychophysical and electrophysiological methods of assessing visual function in artificially raised IOP are generally influenced by the clarity of the retinal image. It is therefore essential to be aware of any changes in ocular refraction induced by changes in body orientation. The present study reports on the refractive changes occurring with body orientation in conditions where accommodation is freely responding, and also immobilized pharmacologically. Ocular refraction varies by less than 0.50D across all body orientations as measured by a laser optometer which provides refractive measurements independent of the perception of blur. These results indicate that pattern-dependent tests of visual function are not likely to be influenced by refractive changes on body inversion.

Adult↗
PubMed1989

Transient acquired ptosis.

Since optometrists are becoming more involved with postoperative cataract care and the often associated traumatic ptosis, a comprehensive discussion of ptosis, including its etiology, classification as either congenital, acquired, or pseudoptosis, and evaluation, is presented. Referral situations and management strategy are discussed. To illustrate these points, a case of transient acquired ptosis is reviewed.

Administration, Topical↗
PubMed1987

The effect of cycloplegia on the visual contrast sensitivity function.

Contrast sensitivity assessment is one of several emergent techniques being considered for inclusion in a visual standards test battery for the Army, particularly for the evaluation of Army aviators. Since a cycloplegic refraction is required for initial selection of candidates for Class I and Class IA flying duty, it is important to determine what effect, if any, cycloplegia has on the contrast sensitivity function. There were 12 subjects tested, all officers in preparation for flight training who had passed a recent Class I flight physical. Contrast sensitivity functions were obtained under normal ambient conditions and in the presence of a glare source both under manifest and cycloplegic conditions. Cycloplegia produced a small reduction in contrast sensitivity under normal ambient conditions, and a greater reduction under glare conditions. For both conditions, the cycloplegia effect was greater for the higher spatial frequency gratings than for the lower.

Aerospace Medicine↗
PubMed1986

A comparison of the effects of cycloplegics on accommodation ability for distance vision and on the apparent near point.

The relationship between distance accommodation ability and the near point of accommodation (NPA) was investigated following the instillation of a cycloplegic. A high correlation between the two parameters was found (p less than 0.001). It is suggested that the effect of a cycloplegic may be more directly assessed using distance accommodation measurement and, in the case of young children, with more ease. A limit of 0.75 D of distance accommodation ability is suggested as a threshold for satisfactory cycloplegia.

Accommodation, Ocular↗
PubMed1979

[Refractometry after treating with atropine and cyclopentolat in childhood (author's transl)].

Using Rodenstock's Refraktometer refractometry was done on 314 hyperopic children (3--14 years) first after treating with Atropine and some weeks later after Cyclopentolat-hydrochlorid. 53,1% of them showed higher hyperopia after Atropine than after Cyclopentolat, the maximum in difference was 1,75 dptr. In another group of children with Cyclopentolat-treating the residual accommodation was determined by four different methods (Refactometer, Apparatus of Schober, Phoropter in a distance of 5,0 and 0,4 mtrs). The results show a minimum of accommodation 45 minutes after application of the drops under special conditions. These conditions are reported as well as a method of correction of hypermetropia due to the values of refractometry or residual accommodation.

Accommodation, Ocular↗
PubMed1979

[Comparative refractioning in juvenile strabismus patients. Experience with the Auto-Refractor 6600 (author's transl)].

122 strabismus patients have been refracted in order to compare the cycloplegic effect of Cyclopentolat-HCl (Zyklolat) and atropin. In young patients the cycloplegic effect of Zyklolat is not as sufficient as that of atropin is. Moreover the positions of cylindrical axes show differences up to 30 degrees under Zyklolat in comparison with atropin. On the other hand we give a report of our experience using the Auto-Refractor 6600, the before-mentioned measurings were performed with. -- The important field of the Auto-Refractor is the routine refractioning of co-operative patients. Using it on young children which are unco-operative the Auto-Refractor is not as sufficient as we hoped it to be.

Accommodation, Ocular↗
PubMed1977

Potential systemic side effects of six common ophthalmic drugs.

Drugs applied topically on the eye are partly absorbed into the eye (possibly 2 to 10%), the remainder can enter the systemic circulation through the conjuctival vessels or from the vessles of the nasolacrimal passages. Drug molecules which enter the stomach and are not transformed into inactive compounds may also enter the blood stream. Systemic reactions to topically applied ophthalmic drugs are shown to be rare and largely preventable.

Adult↗