The effectiveness of sphero-cylindrical correction at a short distance in presbyopic age patients with the first detected astigmatism.

OBJECTIVE

Introduction

The practical results of optical correction without considering the cylindrical component at close dictance do not always satisfy the patient in everyday visual activity. The aim: Compare the effect of sphero-cylindrical and spherical correction in presbyopic patients with the first detected astigmatism at a close distance work.

PATIENTS AND

METHODS

Materials and methods: The article presents the results of a survey of 43 patients (86 eyes) aged 38 to 59 years, on average 47 ± 0.8 years. In all patients, weak astigmatism with a cylinder (Cyl) of 0.5 D to 1.0 D was found. At the diagnostic stage all patients were offered a variant of spherical and sphero-cylindrical optical correction, the data we obtained formed two groups of comparison.

RESULTS

Results

The average value of visual acuity at close distance (33 cm) in patients with spherical correction was better - 0.95 ± 0.06 (73 ± 1.4 optotypes) compared with spherocylindrical correction - 0.61 ± 0.02 (64 ± 0.8 optotypes). The mean distance (66 cm) is better in patients with sphero-cylindrical correction - 1,58 ± 0,01 (70 ± 0,02 optotypes) compared with spherical correction - 0,8 ± 0,05 (55 ± 1,0 optotypes). Also, when using spherical correction, the nearest point of clear vision was closer to the eye, compared with sphero-cylindrical correction, but the range of depth of vision at close range was greater when using sphero-cylindrical correction.

CONCLUSION

Conclusions

Sphero-cylindrical correction at a distance of 66 cm gives a clearer visual acuity - 1.58 ± 0.01 (70 ± 0.02 optotypes) compared with spherical - 0.8 ± 0.05 (55± 1.0 optotypes).