Do myopes converge more with spectacles or contact lenses?

Do myopes converge more with spectacles or contact lenses?

• A. Spectacles
• B. Contact lenses
• C. Both
• D. Neither

Answer: (B)

The amount of convergence during near tasks is tied to how far the object appears to be, which is influenced by optical correction. Spectacle correction for myopia uses a minus lens placed away from the eye, and the vertex distance together with the lens power causes minification of the retinal image of near objects. When near targets look smaller, they also look farther away, so the eyes don’t have to converge as much. Contact lenses sit directly on the cornea, so there’s no vertex-distance minification effect. The near object’s perceived distance remains closer to reality, requiring more convergence. So myopes tend to converge more with contact lenses than with spectacles.

The amount of convergence during near tasks is tied to how far the object appears to be, which is influenced by optical correction. Spectacle correction for myopia uses a minus lens placed away from the eye, and the vertex distance together with the lens power causes minification of the retinal image of near objects. When near targets look smaller, they also look farther away, so the eyes don’t have to converge as much. Contact lenses sit directly on the cornea, so there’s no vertex-distance minification effect. The near object’s perceived distance remains closer to reality, requiring more convergence. So myopes tend to converge more with contact lenses than with spectacles.