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Efficacy of two types of self-adjustable glasses compared to the conventional eyeglasses

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Session Details

Session Title: Orbis Free Paper Session

Session Date/Time: Monday 07/09/2015 | 11:30-12:45

Paper Time: 12:16

Venue: Room 4

First Author: : S.Yoon SOUTH KOREA

Co Author(s): :    J. Kim   H. Kim   K. Seo              

Abstract Details


Eyeglasses with adjustable power lenses can be an effective solution for the correction of refractive error in developing countries or other resource-limited settings. The purpose of this study is to evaluate the efficacy of two different types of self-adjustable glasses, Focusspec® and Childvision,® compared to the conventional eyeglasses.


Division of Preventive Ophthalmology, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Republic of Korea


This study investigated two different types of self-adjustable eyeglasses: the one that used two sliding lenses and another one that applied fluid-filled lens technology. This prospective study enrolled 13 subjects, 25 eyes with spherical refractive power with range between -1.5 to -5.0 diopter measured by auto-refractor (mean age 27.88±1.96). Visual acuity, spherical equivalent (SE), and contrast sensitivity function at 1.5, 3, 6, 12 and 18 cycles per degree (cpd) spatial frequencies were examined with each type of glasses along with conventional glasses.


The visual acuity of two self-adjustable glasses showed no significant difference compared to the conventional glasses. (Conventional glasses; 1.18±0.21, Focusspec®; 1.09±0.15, ChildvisionTM; 1.11±0.16 with Snellen chart, p=0.058). The mean spherical equivalent in the conventional glasses (-2.64 ± 1.32D) was lower than the one in the Focusspec® and ChildvisionTM when measured by lensometer (-3.19 ± 1.16D and -3.39 ± 1.10D, respectively). (p<0.001). However, there was no significant difference between SE of self-adjustable glasses with most suitable powers according to the patients and actual eye measurement with auto-refractor (-3.10 ± 1.26D). (p=1.000) In contrast sensitivity function, there was no statistically significant difference between ChildvisionTM and conventional glasses, whereas Focusspec® showed a significant difference for multiple spatial frequency (1.5, 3, 6 cpd) from the conventional glasses.


Both types of self-adjustable glasses obtained decent visual acuity and similar spherical equivalent judging by the result of automated refractor. However, sliding lens type presented lower contrast sensitivity than the fluid-filled lens type and conventional glasses. Despite the fact that there are certain aspects that have to be improved, self-adjustable glasses can be alternative method for conventional glasses where refraction by trained eye care provider is not available.

Financial Interest:


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