Association of Posterior Pole Degeneration with Axial Length in the Cases of Myopia- A Cross Sectional Study

Posterior pole degeneration is associated with myopia which is understudied specifically in our region. Therefore, we performed the present study with the aim to know the relationship of posterior chorioretinal degeneration with axial length and their interrelationship with each other and other factors like demographic distribution.

In the prospective study 53 males and 34 females (Total 87 cases) that were already diagnosed as myopia were included. The recording of axial length of each eye was done using cooper vision ultrasound digital A-I I which has an ultrasonic frequency of 10 MHz and we utilized automatic freeze method.

Posterior pole degeneration was present only in 14% (23) cases. Upto an axial length of 25mm no eyes showed posterior pole degeneration. As the axial length increases from 26mm onwards the percentage of eyes showing posterior pole degeneration also increases. Upto 100% increase was observed at the axial lengths of 30mm and above. The incidence of posterior pole degeneration increased in all patients who were above 50 in age with no gender difference.

Posterior chorioretinal changes are relatively much less compare to peripheral degenerative changes and they are directly related to an increase in axial length of all myopic eyes, specifically after the length of 25 mm and maximum incidence is observed after the length of 30 mm.