New Delhi, Jan. 13 -- The next big challenge for India's eyewear giants is not demand, branding or store rollouts. It is trained optometrists. The country's eyewear market is scaling faster than its pool of trained personnel.

Recently-listed Lenskart has been upfront about this imbalance, repeatedly flagging the limited availability of qualified optometrists as a key risk across India, South-East Asia and West Asia in its draft red herring prospectus filed with the capital markets regulator in July last year. The company has warned that it continues to face difficulties in finding, training and retaining opticians and optometrists, particularly as it expands into newer markets.

That constraint has sharpened as Lenskart accelerates expan...