20+ Hydro Electric Machinery Interview Questions and Answers

Hydrogel and silicone hydrogel contact lenses differ in their material composition and oxygen permeability.

• Hydrogel lenses are made of a soft, water-containing material while silicone hydrogel lenses are made of a more rigid, oxygen-permeable material.

• Silicone hydrogel lenses allow more oxygen to reach the cornea, making them more comfortable for extended wear.

• Hydrogel lenses are typically cheaper than silicone hydrogel lenses.

• Silicone hydrogel lenses are recommended for peop...read more

Astigmatism is a common eye condition that causes blurred vision due to an irregularly shaped cornea or lens.

• Astigmatism occurs when the cornea or lens is not evenly curved

• It can cause blurred or distorted vision at all distances

• Symptoms include headaches, eye strain, and difficulty seeing at night

• Treatment options include corrective lenses, such as glasses or contact lenses, or refractive surgery

The duochrome test is a vision test used to determine the refractive error of the eye.

• It involves the use of two different colored filters, usually red and green.

• The patient is asked to read letters or numbers on an eye chart while looking through the filters.

• The test helps to determine if the patient has myopia (nearsightedness) or hyperopia (farsightedness).

• If the patient sees the letters or numbers more clearly with one filter compared to the other, it indicates a refracti...read more

Fogging technique is a method used by optometrists to determine the patient's refractive error by temporarily blurring their vision.

• Fogging technique involves placing a lens in front of the patient's eye to induce blur.

• This technique helps to relax the patient's accommodation, allowing for a more accurate measurement of their refractive error.

• By gradually increasing the power of the lens, the optometrist can determine the patient's optimal prescription.

• Fogging technique is co...read more

Against the rule astigmatism is a type of astigmatism where the steepest curve of the cornea is located at the 90-degree axis.

• It is a type of astigmatism where the steepest curve of the cornea is located at the 90-degree axis

• It causes blurred vision at all distances

• It can be corrected with glasses, contact lenses or refractive surgery

JCCC stands for Johnson County Community College.

• JCCC is a community college located in Johnson County, Kansas.

• It offers a wide range of academic programs and courses.

• JCCC provides education and training in various fields, including healthcare.

• The college has a strong optometry program that prepares students for a career as optometrists.

• JCCC is known for its state-of-the-art facilities and experienced faculty.

There are six extra ocular muscles in the human eye.

• The six extra ocular muscles are responsible for controlling eye movement.

• These muscles work together to allow the eyes to move in different directions.

• Damage to these muscles can result in eye movement disorders such as strabismus.

• The extra ocular muscles are named based on their location and function, such as the superior rectus and inferior oblique.

• These muscles are controlled by cranial nerves III, IV, and VI.

Simple astigmatism is a type of astigmatism where the cornea is curved more in one direction than the other.

• Simple astigmatism is a common type of astigmatism.

• It occurs when the cornea is curved more in one direction than the other.

• This causes light to focus on two different points on the retina, resulting in blurred vision.

• Simple astigmatism can be corrected with glasses, contact lenses, or refractive surgery.

Maddox rod test is a diagnostic test used to assess eye muscle imbalance and binocular vision.

• It involves using a special lens called a Maddox rod to create a streak of light that the patient views through one eye at a time.

• The test is used to determine if the eyes are working together properly and to detect any muscle imbalances or weaknesses.

• The patient is asked to report what they see, and the results are used to diagnose conditions such as strabismus and amblyopia.

• The tes...read more

Phoria is a tendency for the eyes to drift out of alignment when one eye is covered, while tropia is a misalignment of the eyes that is always present.

• Phoria is a latent deviation that is only noticeable when one eye is covered

• Tropia is a manifest deviation that is always present

• Phoria can be corrected with exercises or prism glasses

• Tropia requires more aggressive treatment like surgery or vision therapy

Compound astigmatism is a type of astigmatism where both the cornea and lens have different degrees of astigmatism.

• Occurs when both the cornea and lens have different degrees of astigmatism

• Results in blurred or distorted vision at all distances

• Can be corrected with glasses, contact lenses, or refractive surgery

• May be present from birth or develop later in life

• Diagnosis is made through a comprehensive eye exam

Stenopic slit is a narrow opening used to test visual acuity and diagnose refractive errors.

• It is a diagnostic tool used by optometrists and ophthalmologists.

• It helps to isolate and correct refractive errors in the eye.

• The slit can be adjusted to different widths to test different levels of visual acuity.

• It is commonly used in conjunction with other eye tests, such as the Snellen chart.

• Stenopic slit can also be used to diagnose conditions such as cataracts and glaucoma.

Ciliary muscles are the muscles that control the shape of the lens in the eye, allowing for focusing on objects at different distances.

• Located in the eye's ciliary body

• Control the shape of the lens to adjust focus

• Work in conjunction with the lens to focus light onto the retina

• Help with accommodation, the ability to focus on objects at different distances

Regular astigmatism is a common type of astigmatism where the cornea is shaped like a football instead of a basketball.

• It occurs when the cornea is curved more in one direction than the other

• It causes blurred or distorted vision at all distances

• It can be corrected with glasses, contact lenses, or refractive surgery

• It is different from irregular astigmatism, which is caused by an irregularly shaped cornea or lens

• It is diagnosed through a comprehensive eye exam

Mixed astigmatism is a type of astigmatism where both the cornea and lens have different degrees of astigmatism.

• Occurs when the cornea and lens have different degrees of astigmatism

• Can cause blurred or distorted vision at all distances

• Can be corrected with glasses, contact lenses, or refractive surgery

Jackson cross cylinder is a lens used to refine the axis of astigmatism.

• It consists of two cylindrical lenses of equal power but opposite sign placed at right angles to each other.

• The patient is asked to compare the clarity of two images and the axis of the cylinder is adjusted accordingly.

• It is used to determine the axis of astigmatism and to refine the prescription for astigmatism.

• It can also be used to determine the power of the cylinder needed to correct astigmatism.

Autorefractometer measures the refractive error of the eye using infrared light.

• Uses infrared light to measure the refractive error of the eye

• Measures the curvature of the cornea and the length of the eye

• Provides an objective measurement of refractive error

• Used in the initial assessment of patients before prescribing glasses or contact lenses

NPA stands for Near Point of Accommodation and NPC stands for Near Point of Convergence.

• NPA is the closest point at which an individual can focus on an object.

• NPC is the closest point at which an individual can keep both eyes aligned and focused on an object.

• Both NPA and NPC are important measures in assessing the overall health of an individual's visual system.

• Abnormalities in NPA or NPC can indicate underlying vision problems such as convergence insufficiency or accommodati...read more

WFDt test is a visual field test that measures the ability to detect flickering light stimuli.

• WFDt stands for 'White Flicker Detection Threshold'

• It is a type of visual field test used to detect early signs of glaucoma

• The test involves the patient looking at a screen and pressing a button when they see a flickering light

• The results are used to create a map of the patient's visual field

The longest extra ocular muscle is the lateral rectus muscle.

• The lateral rectus muscle is responsible for moving the eye laterally or outward.

• It is innervated by the abducens nerve (cranial nerve VI).

• The muscle originates from the annulus of Zinn and inserts on the lateral surface of the eyeball.

• It is the only muscle that abducts the eye and is responsible for maintaining binocular vision.

• The lateral rectus muscle is prone to injury or paralysis, which can result in diplopia ...read more

Retinoscopy is a technique used to determine the refractive error of the eye by observing the movement of light reflected from the retina.

• The patient's eye is dilated with eye drops

• A retinoscope is used to shine a light into the eye

• The observer looks for the direction and speed of the movement of the light reflected from the retina

• Based on the movement, the refractive error of the eye can be determined

• Retinoscopy is often used to determine the prescription for glasses or cont...read more

Astigmatism is a common vision condition that causes blurred or distorted vision.

• Astigmatism occurs when the cornea or lens of the eye is irregularly shaped.

• It can cause difficulty seeing fine details, headaches, and eye strain.

• Astigmatism can be corrected with eyeglasses, contact lenses, or refractive surgery.

• It often occurs in combination with nearsightedness or farsightedness.

Presbyopia is a condition where the eye loses its ability to focus on nearby objects due to aging.

• Occurs in people over 40 years old

• Caused by the hardening of the lens in the eye

• Symptoms include difficulty reading small print and eye strain

• Corrected with reading glasses or bifocals