Amblyopia, commonly known as ‘Lazy eyes’ is a condition in which the vision of one eye or both eyes is reduced. There is a breakdown in the connection between the eye and the brain
It starts in childhood and is caused by any condition that interferes with focusing during the developmental age. When the brain is presented with two different images, it prefers the sharper image and ignores the image from the weaker eye, making it a lazy eye.
This can occur from
- Difference in the refractive powers of the eyes i.e. one eye having a higher refractive power than the other
- Poor alignment of the eyes ( Squint)
- Any condition that affects the the visual pathway like cataract, corneal opacity etc.
Traditional and commonly used modes of therapy
for amblyopia include spectacles, patching and penalization with atropine eye drops.
Perfect refraction with wearing the most suitable glasses is the first line of treatment.
Patching is done by covering the better eye with an occluder pad or an opaque tape for 2-6 hours every day and making the child do tasks with their lazy eye. This technique, although age old, has high chances of failure and is not very acceptable to children. Adherence i.e. patient compliance in patching is very low and it is not effective beyond 9 years of age. It is a slow process and 700 hours of patching results in 1 line improvement of visual acuity on the snellen’s vision .
Penalization is done by putting Atropine eye drops in the better eye. This technique blurs out the vision of the better eye and forces the lazy eye to work. Some children resist instillation of eye drops and also there are chances of allergic reaction, headache and reverse amblyopia.
Also these modes of treatment are monocular i.e. one eye sees at a time.. The natural state for human beings is to stay binocular i.e. using both the eyes. The chances of failure and relapse in monocular therapies are higher as immediately upon opening the better eye, the brain starts using the images from better eye out of habit and the images from the lazy eye are ignored. This can reverse the benefit on stopping the treatment.
Newer forms of Binocular therapy ( both eyes are used simultaneously) are finding favour to overcome the short comings of the existing treatments. Dichoptic viewing is one such therapy which has shown excellent results. Here contrast adjusted images are presented to the two eyes and the better eye gets an image with lower contrast in comparison to the lazy eye. The brain is trained to pick images from both the eyes and use them together by fusing it into one single image.
Bynocs has used of the dichoptic principle and made engaging games for the treatment of lazy eye.
This patented technology has shown excellent results in the short course of 6 weeks. The usual protocol is to play for 30 minutes each day and 5 days a week. Apart from improving the vision of the lazy eye, Bynocs also helps in the development of 3-D vision, which is considered as the highest form of quality vision. The treatment is scientifically researched and approved by advanced eye centres as a superior method in the management of lazy eyes..