The main objective of this study is to compare the mydriatic effect of tropicamide and epinephrine in rabbits.Preliminary test was done to compare mydriatic effect of balanced salt solution epinephrine and tropicamide.Minimal dose of tropicamide with maximal mydriasis was likewise done using three dilutions.Lastly, comparison of mydriatic effect of tropicamide with epinephrine was done.Preliminary test showed comparable results between tropicamide and epinephrine, with no notable change in size of pupils using BSS.Determination of minimal dose of tropicamide was found to be 0.1 nl of original 0.5% solution diluted with 0.5 ml of BSS, showed maximal mydriasis.Tropicamide showed slower onset of 30 seconds, but onwards until 30 minutes after, it is comparable with sustained mydriasisby epinephrine.This study showed that intracameral tropicamide has comparable mydriatic effect with epinephrine in rabbits.
Animal ; CATARACT ; EPINEPHRINE ; TROPICAMIDE

Accommodation may depend upon such factors as age and refraction. The authors measured and analyzed lens thickness and anterior chamber depth of an emmetropic group(7 persons, 14 eyes) and a myopic group(8 persons, 16 eyes) in adult of second decade during near fixation(30 cm), and weak cycloplegic state with 1% tropicamide eye drop using the Storz OMEGA Compuscan.There were statistically significant difference between accommodation and cycloplegic state in lens thickness and anterior chamber depth(p<0.0l, p<0.05). In the myopic group there was negative correlation between lens thickness and axial length and between lens thickness and anterior chamber depth(r=-0.60(p<0.0l), r=-0.48(p<0.05)). The authors determined that there was not the same difference value of lens thick ness as that of anterior chamber depth between accommodation and cycloplegic state; being 0.04 mm(25%) in emmetropic group and 0.02 mm(22%) in myopic group.
Adult ; Anterior Chamber* ; Humans ; Tropicamide

To predict the mydriatic status of the cataract patients preoperatively, we performed maximal mydriasis test with stepwise instillations of 1% tropicamide and 2.5% phenylephrine or 10% phenylephrine to the out-patients who was scheduled to have cataract operation. Among 210 eyes of 113 patients, the pupillary size of 167 eyes was dilated to 8mm or more and the other 43 eyes were insufficiently dilated to less than 8mm diameter. In the insufficiently dilated group, we have observed the presumable causes of insufficient mydriasis as follows: posterior synechiae, diabetic autonomic pupillopathy, age-related miosis and unknown. By this test, we could predict the mydriatic status of the cataract patient preoperatively and could prepare the appropriate operative method and equipment effectively.
Cataract* ; Humans ; Miosis ; Mydriasis* ; Outpatients ; Phenylephrine ; Tropicamide

In order to evaluate the effect of topical dapiprazole, an alpha-adrenergic receptor blocker, in reversing mydrisis by 1% tropicamide and 2.5% phenylephrine, we studied 89 subjects. 0.5% dapiprazole in one eye of each subject after full dilatation of both pupils. The pupillary diameter was calibrated, and thereafter statistical analysis was performed with student paired t-test. Thirty minutes after instillation of dapiprazole, there was a highly significant difference of the decreasing rate in pupil size between the dapiprazole treated eyes and the control eyes(p<0.001). The time for complete reversal of mydriasis was also at least 4 hours shorter in the dapiprazole treated eyes than the control eyes(p<0.006). This study suggests that 0.5% dapiprazole is effective in reversing mydriasis caused by 1% tropicamide and 2.5% phenylephrine, and also effective in making the eyes comfortable in a shorter time.
Dilatation ; Humans ; Mydriasis* ; Phenylephrine* ; Pupil ; Tropicamide

Photorefraction was performed in 96 cases(191 eyes) after instillation of tropicamide and cyclopentolate for the purpose of screening procedure. And then refraction was also carried out by retinoscope. From this comparison study, phtorefraction provided data which were very close to those obtained from the conventional retinoscopy.
Cyclopentolate ; Mass Screening ; Retinoscopes ; Retinoscopy ; Tropicamide

PURPOSE: The present study investigates the effects of pharmacologic pupil dilatation on ocular, corneal and internal aberrations. METHODS: Sixty-two right eyes of 62 healthy participants were included in the present study. Ocular, corneal and internal aberrations were measured with a KR-1W wavefront aberrometer (Topcon Corp., Tokyo, Japan) before mydriasis in mesopic conditions. After pupil dilatation with a mydriatic drug (phenylephrine chloride 0.5% + tropicamide 0.5%) (Mydrin-P, Santen, Osaka, Japan), the measurements were repeated. The wavefront data of 4-mm and 6-mm diameter zones were analyzed. The changes of aberrations before and after mydriasis were evaluated by paired t-test. RESULTS: The values of ocular, corneal and internal spherical aberrations before and after mydriasis on the 4-mm diameter pupil zone were not statistically significantly different. On the 6-mm diameter zone, the ocular and internal spherical aberrations were statistically significantly different (p = 0.025, p = 0.002, respectively, paired t-test). However, the corneal aberrations did not show significant changes. The internal aberrations average before mydriasis was -0.043 (+/-0.21) microm and was shifted in a negative direction to -0.093 (+/-0.17) microm after mydriasis. The ocular aberrations average also changed toward negative after mydriasis. The high-order aberrations and astigmatism did not change significantly. CONCLUSIONS: The ocular and internal spherical aberrations changed toward negative with mydriasis in the participants' eyes suggesting the change of the ocular spherical aberration to be attributed to internal changes.
Astigmatism ; Dilatation ; Eye ; Mydriasis ; Pupil ; Tokyo ; Tropicamide

We assessed the combined effects of dapiprazole, an alpha-adrenergic receptor blocker, with pilocarpine. direct-acting parasympathomimetics, on reversing mydriasis and cycloplegia in 40 eyes (20 subjects) who received 1% tropicamide or 2.5% phenylephrine for pupillary dilation and cycloplegic refraction. These results were compared to 40 eyes (20 subjects) that received dapiprazole alone. The study was divided into four groups, each of which consisted of 20 eyes that received either 1% tropicamide or 0.5% phenylephrine followed by instillation of 0.5% dapiprazole alone or in combination with 2% pilocarpine. A significant difference in the reduction of pupil size and the increase in accommodative amplitude has been observed between the groups that received dapiprazole alone and those received both dapiprazole and pilocarpine(p<0.001). These results suggest that dapiprazole and pilocarpine eyedrops have additive effects on reversing both mydriasis and cycloplegia after instillation of 1% tropicamide or 2.5% phenylephrine for pupillary dilation and cycloplegic refraction.
Mydriasis* ; Ophthalmic Solutions ; Parasympathomimetics ; Phenylephrine ; Pilocarpine* ; Pupil ; Tropicamide

Refractions were performed in healthy 60 newborn babies, 31 males and 29 females, by retinoscopy after instillation of 1% tropicamide in order to investigate the distribution of refractive states of newborn babies. Average refractive error is +1.51 +/- 2.23D in male, +1.93 +/- 1.78D in female, and +1.17 +/- 2.03D in general. 72.5% of them were hypermetropia, 10.0% were emmetropia, and 12.5% were myopia. There was no significant difference according to sex, laterality, birth weight, and method of delivery(p>0.1).
Birth Weight ; Emmetropia ; Female ; Humans ; Hyperopia ; Infant, Newborn* ; Male ; Myopia ; Refractive Errors ; Retinoscopy ; Tropicamide

PURPOSE: To evaluate the effectiveness of a cycloplegic regimen using 0.5% tropicamide and 0.5% phenylephrine (Tropherine, Hanmi Pharm), in addition to 1% cyclopentolate, in hyperopic children. METHODS: The medical records of hyperopic patients below the age of 14 years who had undergone cycloplegic retinoscopy were retrospectively reviewed. Cycloplegic refractions were performed using one of two cycloplegic regimens. Regimen 1 was a Tropherine-added regimen comprising the administration of one drop of 1% cyclopentolate followed by two to three drops of Tropherine added at 15-minute intervals. Regimen 2 was a cyclopentolate-only regimen comprising the administration of three to four drops of 1% cyclopentolate at 15-minute intervals. The mean difference between noncycloplegic and cycloplegic refraction was compared between the two regimens. RESULTS: A total of 308 eyes of 308 hyperopic children were included. The mean difference (±standard deviation) in the spherical equivalent (SE) between cycloplegic and noncycloplegic refraction was significantly larger in regimen 2 than in regimen 1, with values of +1.70 ± 1.03 diopters (D) and +1.25 ± 0.89 D, respectively (p=0.001). The SE change after cycloplegia was significantly different between the two regimens only in patients aged 5 years or younger (p=0.001), particularly in those with high hyperopia with an SE ≥5 D (p=0.005) or fully accommodative esotropia (p=0.009). There was no significant difference between the two regimens in patients older than 5 years, regardless of the presence of high hyperopia or fully accommodative esotropia. CONCLUSIONS: The Tropherine-added regimen exerted a weaker cycloplegic effect than the cyclopentolate-only regimen, particularly in children under the age of 5 years with high hyperopia or fully accommodative esotropia. However, the difference in refraction between the two regimens was small. A Tropherine-added regimen can be effective in hyperopic children, with less associated discomfort than the instillation of cyclopentolate.
Child* ; Cyclopentolate* ; Esotropia ; Humans ; Hyperopia ; Medical Records ; Phenylephrine* ; Retinoscopy ; Retrospective Studies ; Tropicamide*

Some patients are very sensitive to glare after diagnostic mydriasis with tropicarnide or phenylephrine. It would be desirable to reverse the effects of mydriasis rapidly and safely after diagnostic mydriasis. We assessed the effect of topical dapiprazole, an alpha adrenergic receptor blocker, in reversing mydriasis in 40 dark brown Iris subjects who received tropicamide 1% or phenylephrine 2.5%. There was a significant difference in the decrease in pupil size between the eyes that received dapiprazole and the control eyes. This study suggests that dapiprazole 0.5% eye drops are effective and safe in reversing mydriasis after instilation of tropicamide 1% or phenylephrine 2.5% into dark brown irides.
Glare ; Humans ; Iris ; Mydriasis* ; Ophthalmic Solutions ; Phenylephrine ; Pupil ; Receptors, Adrenergic ; Tropicamide