A Case Study on the Selection of Materials for Eye Lenses

Table 1

Candidate materials for eye lenses and their scores.

Property	Material
	PMMA	PC	PS	PVC	PET	PA
Fracture toughness (MPa·m^1/2)	0.70–1.6 (5 p)	2.1–4.60 (8 p)	0.70–1.1 (3 p)	1.46–5.12 (9 p)	1.01–1.70 (5 p)	0.58–8.03 (5 p)
Density (Mg/m^3)	1.16–1.22 (5 p)	1.14–1.21 (5 p)	1.04–1.05 (7 p)	1.30–1.58 (3 p)	0.10–1.40 (10 p)	1.00–1.42 (5 p)
Easy manufacturing	+++ (10 p)	++ (6 p)	+++ (10 p)	++ (6 p)	+++ (10 p)	+++ (10 p)
Price ($/kg) [9]	1.70–2.40 (8 p)	3.80–4.30 (5 p)	1.30–1.60 (9 p)	1.00–1.20 (10 p)	1.44–2.51 (8 p)	2.90–11.50 (1 p)
Transparency [9]	Transparent (10 p)	Transparent (10 p)	Opaque (1 p)	Transparent to opaque (5 p)	Opaque (1 p)	Opaque (1 p)
Elastic modulus (GPa)	2.24–3.80 (9 p)	2.21–2.44 (10 p)	2.28–3.34 (9 p)	2.14–4.14 (9 p)	0.30–4.41 (10 p)	0.67–4.51 (10 p)
Total score	47 p	44 p	39 p	42 p	44 p	32 p