December 1, 2020
By Divya Jagadeesh, BOpt, MPhil, PhD
No level of myopia is considered safe, and any increase in myopia is said to increase the risk of developing complications.1 Thus, the goal of myopia management should not only focus on correcting the refractive error to restore vision but should address any risk of progression and/or complications.
Therefore, when examining an individual with myopia, in addition to evaluating refractive error and axial length, there is a need for additional assessments that aid in estimating the risk of progression and evaluating the health of the eye.
Estimating the Risk of Progression
Myopia progression rates may vary depending on several factors, including age, gender, ethnicity, genetic/parental, and environmental factors. For example, a young myopic child of Asian ethnicity and myopic parents is likely to be at risk of faster progression; such an individual may require a myopia management strategy that has been proven to provide a significant level of control.2,3 Table 1 lists the various risk factors found associated with myopia progression. Considering these risk factors in association with refractive error and/or axial length assessment may indicate if an individual is at increased risk of progression.
Table 1: Risk Factors Associated with Myopia Progression
More recently, we have seen an effort to integrate the clinical measurements of refractive error and axial length with the demographic, parental, and environmental factors to provide a comprehensive risk assessment. For example, the Oculus Myopia Master enables the measurement of corneal curvature, refractive error, and axial length in a single instrument. Additionally, it provides an estimation of the risk of future progression utilizing percentile charts for axial length dimensions, demographic, parental, and environmental risk factors. (The Myopia Master is not yet FDA approved.)
Figure: (a) & (b) Tessellated fundus appearance as denoted by yellow pointers in (a) Color fundus image (b) Gray scale fundus image of the same eye. Temporal crescent as denoted by yellow pointers in (c) Color fundus image (d) Gray scale fundus image of the same eye. Optic disc ovality and rotation – ovality index measured as the ratio of the longest (LL’) and shortest (SS’) diameter. (b): rotation ; deviation of the long diameter (LL’) of the optic disc from PC. The reference line (FC), 90° is a horizontal line connecting the fovea (F) and the centroid of the optic disc (C) and PC is the perpendicular. Oval discs had ovality index ratios exceeding 1.30. Rotated discs – was >15°.
In addition to cataloging the demographic and environmental-related risk factors, an examination of the eye is useful as the presence of certain posterior segment features/signs is linked with progression.
- Appearance of tessellations (tigroid appearance) in the fundus may be associated with myopia progression.14,15 Of the myopic children who presented with tessellated fundus appearance, 76 percent progressed over a 10-year period.16
- Optic nerve ovality and rotation was associated with myopia progression.17
- Due to its strong association with myopic refractive error and frequency of occurrence even in young myopic eyes,18 myopic conus is of interest. Myopic conus, usually a temporal crescent (sometimes inferior), may increase in size in direct proportion with axial length change.19
Evaluation of the Health of the Eye
A thorough and comprehensive examination of the eye helps appraise the current and future risk of eye disease. Although degenerative changes such as chorioretinal atrophy are more commonly observed in mature eyes, there are many posterior segment conditions/changes such as lattice degeneration and retinal breaks observed in young myopes and, in some instances, may require immediate attention. Table 2 catalogs the posterior segment signs observed in myopic eyes.
Managing Myopia Progression
If determined that the eye is at risk of progression, several interventions exist from which a strategy appropriate for the individual may be chosen. These range from spectacle lenses (peripheral defocus, executive bifocal, defocus inducing multiple segments), contact lenses (dual focus, reduction of peripheral defocus and/or inducing myopic defocus, extended depth of focus, orthokeratology), pharmaceutical (atropine), and environmental strategies (increased outdoor time).21
Table 2: Features/Signs Linked with the Progression of Myopia
If the myopic eye exhibits one or more signs described in Table 2, depending on the feature/sign, the practitioner may a) record and monitor for changes at future visits (for example, white without pressure); b) monitor more closely (for example, lattice degeneration in a moderately myopic eye); or c) refer to a specialist for treatment (for example, retinal detachment or retinal break). All individuals with myopia and/or their caregivers/families should be educated on the possible risk of progression and complications associated with myopia, the importance of myopia management, and any unwanted effects associated with such treatments.
Divya Jagadeesh, BOpt, MPhil, PhD, is a research fellow with BHVI. She acknowledges the support of Professor Padmaja Sankaridurg for the editing and revision of this clinical article.
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