We analysed the differences between the values of noncycloplegicautomated refraction and manifest refraction by ophthalmologist 150 patients(274 eyes)were studied. We divided these patients into five groups according to the age; Group 1 included patients under 10 yea(n=50 eyes), Group 2 from 10 yrs to 19 yrs(n=74 eyes), Group 3 from 20 yrs to 39 yrs(n=66 eyes), Group 4 from 40 yrs to 49yrs(n=39 eyes), Group 5 over 50 yrs(n=46 eyes); We used Canon Auto Ref R-10 autorefractor and ophthalmologist's refractions were the results of both subjective refraction by retinoscope and objective refraction used by cross cylinder. Between the two examinations, the percentages of eyes of disagreement beyond +/-0.5D were 22%(group 1), 39.2%(group 2), 14.1%(group 3), 15.8%(group 4), 17.4%(group 5) in spherical power; 18%, 23%, 27.3%, 29%, 15.2% in cylindrical power respectively; 20%, 31.9%, 18.2%, 15.8%, 19.6% in spherical equivalent respectively and the percentages of eyes of disagreement beyond +/-10 degrees in cylindrical axis were 25%, 42.6%, 39.2%, 40%, 52.9% respectively. There was no statistic significance between the age groups when we compared the absolute differences of values between two examinations. Conclusively, this study revealed that there were large differences between the values of noncycloplegic automated refraction and manifest refraction by ophthalmologist in the large amout of patients and then our results indicated that automated refraction was dangerous to patient's eyes and subjective refinement was needed by ophthalmologist if patients wanted the spectacle or contact lens.
Axis, Cervical Vertebra ; Humans ; Retinoscopes

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: We analyzed the difference in values between noncycloplegic and cycloplegic autorefraction and refraction, as measured by ophthalmologist, in children according to age. METHODS: We classified the 84 children (153 eyes) whose best corrected visual acuity was better than 0.6 into four groups according to age. The first age group ranged from 29 to 57 months (36 eyes); the second age group ranged from 58 to 75 months (47 eyes); the third age group ranged from 76 to 95 months (36 eyes); and the fourth age group ranged from 96 to 121 months (34 eyes). The children were examined with an autorefractometer (Canon Auto Ref RK-2) and a retinoscope before and after cycloplegia. RESULTS: The children in all age groups tend to show more myopia in autorefraction than refraction regardless of cycloplegia. Also, differences in spherical component and spherical equivalents in noncycloplegic autorefraction and cycloplegic refraction were regarded as significant statistically (P<0.05) in all age groups. However, in all groups, none of the refractive values in cycloplegic autorefraction and refraction were statistically significant. CONCLUSION: Refraction measurement should be recommended for cycloplegic refraction in children. It is suggested that cycloplegic autorefraction could be useful for the refraction partially.
Child* ; Humans ; Myopia ; Retinoscopes ; Visual Acuity

The aims of the our study are investigation of the average value of the refraction, anterior chamber depth(ACD), axial length(AL), and the interrelationship of refraction, ACD, AL, weight and height of normal newborn infant. Objects of this study are 236 eyes of 118 normal newborn infants that have been examined with retinoscope under the cycloplegia and the axial length and anterior chamber depth have been measured by ultrasonogram. And so we gained following results. The average value of refraction(+1.85 +/- 1.86D), the average value of the AL(17.5 +/- 0.68mm) and the average value of ACD(2.62 +/- 0.21mm) did not show significant difference between male and female newborn infants. The correlation coefficient between AL and ACD. refraction and AL, weight and AL, and height and AL were 0.326(P<0.001), -0.305(0.0010.1).
Anterior Chamber* ; Female ; Humans ; Infant, Newborn* ; Male ; Retinoscopes ; Ultrasonography

PURPOSE: To evaluate the performance of the hand-held and table-top autorefractokeratometer in measuring refractive errors by comparing them with cycloplegic retinoscopy. METHODS: Included in the study were 112 eyes of 112 pediatric patients whose mean age was 6.78 +/- 2.61 years (range, 2 to 12 years). The refractive errors of all the eyes were measured with and without cycloplegia using a hand held autorefractokeratometer (Retinomax K-plus 3), table top autorefractokeratometer (Canon RK-F1) and performing cycloplegic retinoscopy. The spherical equivalent, cylindrical axis and keratometer values were statistically compared. RESULTS: The mean spherical equivalent obtained from the Retinomax K-plus 3 was significantly less hyperopic than that of Canon RK-F1 (p = 0.004) before cycloplegia. When the Bland Altman analysis was performed in comparisons of spherical equivalent values measured with the Retinomax K-plus 3, Canon RK-F1 and cycloplegic retinoscopy, it was seen that almost all of the differences between the measurements remained within the range of +/-2 standard deviation. Good agreement was found between Retinomax K-plus 3 and Canon RK-F1 for the Jackson cross-cylinder values at axis 0degrees and 45degrees; keratometer values respectively. CONCLUSIONS: The refractive error components were highly correlated between the two instruments and cycloplegic retinoscopy.
Child ; Child, Preschool ; Female ; Humans ; Male ; Refractive Errors/*diagnosis ; *Retinoscopes ; *Retinoscopy ; Vision Screening

PURPOSE: To evaluate the performance of the hand-held and table-top autorefractokeratometer in measuring refractive errors by comparing them with cycloplegic retinoscopy. METHODS: Included in the study were 112 eyes of 112 pediatric patients whose mean age was 6.78 +/- 2.61 years (range, 2 to 12 years). The refractive errors of all the eyes were measured with and without cycloplegia using a hand held autorefractokeratometer (Retinomax K-plus 3), table top autorefractokeratometer (Canon RK-F1) and performing cycloplegic retinoscopy. The spherical equivalent, cylindrical axis and keratometer values were statistically compared. RESULTS: The mean spherical equivalent obtained from the Retinomax K-plus 3 was significantly less hyperopic than that of Canon RK-F1 (p = 0.004) before cycloplegia. When the Bland Altman analysis was performed in comparisons of spherical equivalent values measured with the Retinomax K-plus 3, Canon RK-F1 and cycloplegic retinoscopy, it was seen that almost all of the differences between the measurements remained within the range of +/-2 standard deviation. Good agreement was found between Retinomax K-plus 3 and Canon RK-F1 for the Jackson cross-cylinder values at axis 0degrees and 45degrees; keratometer values respectively. CONCLUSIONS: The refractive error components were highly correlated between the two instruments and cycloplegic retinoscopy.
Child ; Child, Preschool ; Female ; Humans ; Male ; Refractive Errors/*diagnosis ; *Retinoscopes ; *Retinoscopy ; Vision Screening