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TR90 gives these tortoiseshell butterfly glasses the right mix of bend and toughness — perfect for those seeking butterfly styles in a dependable tortoiseshell finish.
Configure your lenses
Free UV400, anti-scratch & anti-reflective included
Verified by licensed opticians
Endless customization — clear, blue-light, tinted & more
Worldwide delivery: 6–10 days
24/7 customer support
Product Detail
What Our Customers Say
Conception
Why are the lenses so affordable? Blacksheep is the world's first eyewear incubator offering factory-price glasses – The lenses are designed by renowned manufacturers. You get your eyeglasses directly from the factories, with no middlemen or hidden fees.
Choose the Right Lenses for Your Glasses
All our lenses are customizable — from clear and blue-light options to tinted lenses for sun protection.
* Production time varies depending on the prescription, from 1 - 4 days.
Prescription Types
Single Vision
Corrects one field of vision:
near, intermediate, or distance.
Progressive Vision
Seamless transition between multiple
vision distances without lines.
Lens Types
Blue Light Protection
Filters blue light from screens to
reduce eye strain.
Tinted & Gradient
Stylish tint for sun protection
and driving.
Photochromic
Auto-darkens in sunlight and
lightens indoors.
Polarised
Reduces glare from reflective
surfaces for outdoor activities.
Lens Materials
Classic Lens
Standard CR-39 for excellent optical
clarity and daily use.
Premium Lens
Thinner, lighter high-index 1.60. Designed for
daily comfort and active routines.
Superior Lens
Thinnest High-Index 1.67 for
high-power prescriptions.
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