Year : 1983 | Volume
: 31 | Issue : 7 | Page : 1029--1030
Retinal visual acuity in amblyopia
OP Billore, AP Shoroff, RJ Mirza, Paresh Antani
Rotary Eye Institute, Navsari, Gujarat, India
O P Billore
Rotary Eye Institute, Navsari, Gujarat
|How to cite this article:|
Billore O P, Shoroff A P, Mirza R J, Antani P. Retinal visual acuity in amblyopia.Indian J Ophthalmol 1983;31:1029-1030
|How to cite this URL:|
Billore O P, Shoroff A P, Mirza R J, Antani P. Retinal visual acuity in amblyopia. Indian J Ophthalmol [serial online] 1983 [cited 2021 Jun 12 ];31:1029-1030
Available from: https://www.ijo.in/text.asp?1983/31/7/1029/29738
The Rodenstock Retinometer measures retinal and cortial functions independent of the influence of the optical media of the eye. Retinal visual acuity was measured in 54 Ambyyopia cases before starting the pleoptic treatment.
Retinal visual acuity was measured in 54 amblyopia cases by Retinometer. It was more than snellen's visual acuity (LVA 2) in 88.88% cases (48 cases.). RVA was equal to LVA 2 in 05.56% cases (03 cases). In 2 cases RVA was less than LVA 2. (05.56%) [Table 1]. Out of 54 cases of amblyopia, treatment was taken by 42 cases only 12 cases did not turn up for treatment. 6 week pleoptic and occlusion treatment was taken by 31 cases (73.81%) and incomplete treatment was taken by 11 cases (26.15%). 25 cases (59.51%) were having amblyopia with squint and 17 cases (14.48%) without squint. [Table 2].
Out of 31 cases who had taken complete treatment in 4 cases (12.9%) vision improved completely as shown by retinometer before starting the treatment. Lesser extent of improvement was noted in 87.10% cases. One line improvement on Snellen's chart was present in 21.43% cases. Two lines and three lines improvement was observed in 13 cases (7.14%) each. Four lines improvement was seen in 2 cases (4.76%) and 6 lines improvement in one case only (2.38%). [Table 3].
It was a surprise to note that retinal visual acuity was quite high as compared to corrected visual acuity. As the aetiology of amblyopia is not known it is difficult to say why in every case. we can not improve the vision. From the [Table 4] it is clear that in 26 cases (68.42%) retinal visual acuity was 6/12 to 6/6 while 6/36 to 6/18 was seen in 5 cases (13.15%) only. Finger counting to 6/60 was observed in 7 cases (18.42%) only. While F.C. to 6/60 vision was present in 27 cases (64.20%) in LVA 2 and 6/36 to 6/12 was present in 39.47% only.
Retinal visual aquity (VA) was more than corrected visual acuity by glasses or contact lens (LVA 2) in 88.8% cases. In 5.56% cases RVA was less than LVA 2 and equal to it in 5.56% cases. Thus retinometer shows that in amblyopia we can improve vision in 88.8% cases. [Table 1]
Retinal visual acuity was measured in amblyopia and it was observed that it was higher than LVA 1 in 75.92% cases and more than corrected visual acutiy (LVA 2) in 88.8% - cases. But we could not improve vision in all cases and to the same extent as shown by retinometer. But only in 12.5% cases vision could be improved fully as also guided by retinometer. Partial improvement occured in 87.10% cases. Gastalder and Green (1971) are of the opinion that RVA is over estimated in amblyopic cases. But our opinion is contrary. We have observed in large number of cases that in majority retinometer reading was not exaggerated. In ametropia and emmetropia cases retinal visual acuity was not over estimated. In amblyopia cases we can pick up those cases in which vision will improve after treatment. Vision could not be improved in all cases as only one method was tried for treatment, other methods like red filter, intermittant stimulation were not tried. And also the treatment was given for 6 weeks only for reasons of lack of co operation on the part of patient. In one case vision improved to 6/6 when he was given pleoptic treatment 3 times in a year. Another case was taking treatment for four years irregulary on hospitalization his vision improved to 6/6 with pleoptic and occlusion treatment. Retinometer reading in this case was 6/6 in both eyes. Retinometer indicates potentiality of improvement.
Retinometer indicates potentiality of improvement of vision in amblyopia. It further guides how long patient should be followed and instructed for pleoptic exercises.