Soft Contact Lens Design and Validation
Added on 2023-01-19
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Running head: SOFT CONTACT LENS DESIGN AND VARIDATION
Soft contact lens design and validation
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Soft contact lens design and validation
Name
Institution Affiliation
SOFT CONTACT LENS DESIGN AND VARIDATION
Introduction
Soft contact lenses are medical devices largely used to correct the eye refractive error
for more than 125 million people worldwide. Unlike spectacle lenses which are used in
conventional glasses, soft contact lenses should be designed to fit the user’s eye besides being
able to correct his vision. During the fitting process, the surface of the contact lens deflects to
fit the eye shape; therefore, the optical power of the soft lens on-eye differs from the one
originally manufactured and tested off-eye. The aim of this report is to investigate the
geometric and optical characteristics of soft contact lenses ON and OFF the human eye.
Soft contact lenses have had a huge effect on the world contact lens market ever since
they turned out to be broadly accessible in the primary 1970s. Since their institution, the sum
of soft contact lenses being recommended globally has consistently risen and it is majorly the
sale of soft contact lenses that is accountable for a business that is approximated to be worth
about $8 billion yearly. A recent study by Welford (1986) has shown that soft lenses
presently make up approximately 86% of all contact lens refits globally. The fullness of the
contact lens market with soft lenses has happened mostly for two reasons. First, soft lenses
offers the wearer what they perceive as the most essential needs for effective contact lens
wear; good comfort and good vision. The main hindrance with inflexible lenses is commonly
accepted as being their deprivation of comfort, and specifically, their primary uneasiness.
Second, improvements in manufacturing know-how have led the business to soft lenses and,
yet further, to the idea of disposability (Weissman and Gardner, 1984).
Problems with eyesight are the main reason why almost 50% of the population in
industrialized countries wears optical lenses. Myopia is one of the major eye disorders
leading to blindness. Understanding its causes and treatment can be a way of reducing its
Introduction
Soft contact lenses are medical devices largely used to correct the eye refractive error
for more than 125 million people worldwide. Unlike spectacle lenses which are used in
conventional glasses, soft contact lenses should be designed to fit the user’s eye besides being
able to correct his vision. During the fitting process, the surface of the contact lens deflects to
fit the eye shape; therefore, the optical power of the soft lens on-eye differs from the one
originally manufactured and tested off-eye. The aim of this report is to investigate the
geometric and optical characteristics of soft contact lenses ON and OFF the human eye.
Soft contact lenses have had a huge effect on the world contact lens market ever since
they turned out to be broadly accessible in the primary 1970s. Since their institution, the sum
of soft contact lenses being recommended globally has consistently risen and it is majorly the
sale of soft contact lenses that is accountable for a business that is approximated to be worth
about $8 billion yearly. A recent study by Welford (1986) has shown that soft lenses
presently make up approximately 86% of all contact lens refits globally. The fullness of the
contact lens market with soft lenses has happened mostly for two reasons. First, soft lenses
offers the wearer what they perceive as the most essential needs for effective contact lens
wear; good comfort and good vision. The main hindrance with inflexible lenses is commonly
accepted as being their deprivation of comfort, and specifically, their primary uneasiness.
Second, improvements in manufacturing know-how have led the business to soft lenses and,
yet further, to the idea of disposability (Weissman and Gardner, 1984).
Problems with eyesight are the main reason why almost 50% of the population in
industrialized countries wears optical lenses. Myopia is one of the major eye disorders
leading to blindness. Understanding its causes and treatment can be a way of reducing its
SOFT CONTACT LENS DESIGN AND VARIDATION
progressiveness. The disease is said to be an interplay of genetics and environmental factors.
It is higher and prevalent to the individuals whose parents are myopic which indicate that it is
genetically associated. Also, the study indicates that it also associated with education and the
amount of time spent doing work which tends to increase optical blur. The condition has
resorted to pathological problem increase, therefore, the effort to reduce myopia problem has
been devised.
According to Austin (1999), indicate that the problem of short-sightedness and
problems associated with myopia can be corrected by use of contact lenses, however, the
writer considers the disadvantages associated with contact lens wearing and effects of the
thickness of the contact lens have on the eye. Cooperand Tkatchenko (2018) suggest that the
use of spectacles and contact lenses is one of effective measure to reduce short-sightedness
are pathological problems associated with myopia. Contact lenses are made to correct the
visual aspect of the patient also to fit the eye of the patient. There are major comparisons to
contact lenses on the eye and off the eye which affect the design of the contact lens. These
are concerns to the design and validation to their perspective. There are different types of
contact lenses, here we shall look and examine two types of soft contact lenses. These are
silicone hydro-gel and Hydro-gel.
Young (2018) proposes that contact lens materials are nice examples of bio-materials.
A bio-material might be designated as an artificial or natural material that is appropriate for
institution into living matter, particularly as part of a medical implement. The term covers a
wide range of expertise, comprising tissue manufacturing, synthetic organs, bio-ceramics,
clinical implements, and implantable medicine delivery structures. Contact lenses are
categorized as a clinical implement in a majority of nations. Very few individuals are
possibly to get through life minus having a particular type of bio-material instituted in their
bodies (Yap, Archer, Gobbe, and Reinstein, 2016). The most widespread examples used
progressiveness. The disease is said to be an interplay of genetics and environmental factors.
It is higher and prevalent to the individuals whose parents are myopic which indicate that it is
genetically associated. Also, the study indicates that it also associated with education and the
amount of time spent doing work which tends to increase optical blur. The condition has
resorted to pathological problem increase, therefore, the effort to reduce myopia problem has
been devised.
According to Austin (1999), indicate that the problem of short-sightedness and
problems associated with myopia can be corrected by use of contact lenses, however, the
writer considers the disadvantages associated with contact lens wearing and effects of the
thickness of the contact lens have on the eye. Cooperand Tkatchenko (2018) suggest that the
use of spectacles and contact lenses is one of effective measure to reduce short-sightedness
are pathological problems associated with myopia. Contact lenses are made to correct the
visual aspect of the patient also to fit the eye of the patient. There are major comparisons to
contact lenses on the eye and off the eye which affect the design of the contact lens. These
are concerns to the design and validation to their perspective. There are different types of
contact lenses, here we shall look and examine two types of soft contact lenses. These are
silicone hydro-gel and Hydro-gel.
Young (2018) proposes that contact lens materials are nice examples of bio-materials.
A bio-material might be designated as an artificial or natural material that is appropriate for
institution into living matter, particularly as part of a medical implement. The term covers a
wide range of expertise, comprising tissue manufacturing, synthetic organs, bio-ceramics,
clinical implements, and implantable medicine delivery structures. Contact lenses are
categorized as a clinical implement in a majority of nations. Very few individuals are
possibly to get through life minus having a particular type of bio-material instituted in their
bodies (Yap, Archer, Gobbe, and Reinstein, 2016). The most widespread examples used
SOFT CONTACT LENS DESIGN AND VARIDATION
today consist of contact lenses, dental fillings, heart valves, intraocular lenses, and stents.
This list in its own stresses just how varied bio-materials should be in order to fulfil their very
particular end use; for instance; a contact lens material has very unique characteristics to a
material used for dental fillings.
The hydrogel is made from gel-like water containing plastic called hydro-gel. The
lenses are very thin, elastic and take the shape of the front part of the eye. The lenses were
introduced in the 1970s which made contact wear of the soft lenses more popular since they
were comfortable. The soft lenses were alternative of lenses made from Plastic material
polymethyl methacrylate (PMMA) which took weeks to adapt and many people could not
successfully wear them due to their discomfort.
Silicon hydro-gel is the more populous, porous and advanced type of the hydro-gel
lenses. They were introduced in 2002. They allow more oxygen to reach the cornea. For bio-
material to be effective in its usage, it follows that it should similarly be bio-compatible. Bio-
compatibility is the ability of a material to perform with a suitable host reaction in a particular
usage. A “suitable host reaction” would comprise not having poisonous or hurtful impacts on
biological structures (Patel, 1998). Bio-materials produced for use as contact lenses should
not just fulfil all these necessities for safe application in the eye, but in addition they should
likewise have very particular attributes like being transparent and stay like that on-eye, be at
ease and be comparatively inexpensive to produce.
To examine major comparison characteristics of the contact lens on the eye and off
the eye, we are going to look at research done to find the differences in design. A research
was conducted to find the optical performance of the two mentioned lenses to examine their
on and off the eye performance. A monochromatic aberration of contact lenses was measured
on the eye using Hartmann ocular aberrometer lambda= 850 and another one was measured
today consist of contact lenses, dental fillings, heart valves, intraocular lenses, and stents.
This list in its own stresses just how varied bio-materials should be in order to fulfil their very
particular end use; for instance; a contact lens material has very unique characteristics to a
material used for dental fillings.
The hydrogel is made from gel-like water containing plastic called hydro-gel. The
lenses are very thin, elastic and take the shape of the front part of the eye. The lenses were
introduced in the 1970s which made contact wear of the soft lenses more popular since they
were comfortable. The soft lenses were alternative of lenses made from Plastic material
polymethyl methacrylate (PMMA) which took weeks to adapt and many people could not
successfully wear them due to their discomfort.
Silicon hydro-gel is the more populous, porous and advanced type of the hydro-gel
lenses. They were introduced in 2002. They allow more oxygen to reach the cornea. For bio-
material to be effective in its usage, it follows that it should similarly be bio-compatible. Bio-
compatibility is the ability of a material to perform with a suitable host reaction in a particular
usage. A “suitable host reaction” would comprise not having poisonous or hurtful impacts on
biological structures (Patel, 1998). Bio-materials produced for use as contact lenses should
not just fulfil all these necessities for safe application in the eye, but in addition they should
likewise have very particular attributes like being transparent and stay like that on-eye, be at
ease and be comparatively inexpensive to produce.
To examine major comparison characteristics of the contact lens on the eye and off
the eye, we are going to look at research done to find the differences in design. A research
was conducted to find the optical performance of the two mentioned lenses to examine their
on and off the eye performance. A monochromatic aberration of contact lenses was measured
on the eye using Hartmann ocular aberrometer lambda= 850 and another one was measured
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